Gluten Free Raspberry Crumble Bars
Buttery, oat-forward crumble bars studded with a bright raspberry filling — all made gluten-free without sacrificing texture. They bake up crisp on the edges, tender in the middle, and are perfect for potlucks, lunchboxes or a simple dessert.
Ingredient Spotlight
Certified gluten-free all-purpose flour blend
A manufactured mix of gluten-free flours and starches (commonly rice flour, tapioca or potato starch, sometimes sorghum or xanthan gum) designed to mimic wheat all-purpose flour for baking. It isn’t tied to a specific cuisine but is a modern product to accommodate celiac disease and gluten-free diets. It tastes neutral and has no wheat aroma, though baked goods can be denser or crumblier because there’s no gluten network. Find it in the gluten-free aisle of supermarkets or online (brands like Bob’s Red Mill or King Arthur); if you don’t need gluten-free, substitute regular all-purpose flour 1:1, or use a homemade GF mix of rice flour + tapioca starch + potato starch plus a binder like xanthan gum as a close replacement.
Ingredient Spotlight
Almond flour (finely ground)
Finely ground blanched almonds used widely in gluten-free, paleo, and European baking traditions (almonds originate from the Mediterranean/Middle East). It has a rich, nutty, slightly sweet flavor and a naturally moist texture and aroma compared with grain flours. It contributes tenderness and a crumbly, dense crumb in baked goods and won’t provide the structure gluten does. Find it in the baking or natural foods aisle and specialty shops; good substitutes are almond meal (coarser, similar flavor), or if not avoiding gluten, use all-purpose flour (adjusting for drier texture) or a blend of oat flour plus a bit of butter/oil to compensate for lost fat.
Ingredient Spotlight
Old-fashioned rolled oats (certified gluten-free)
Rolled oats are whole oat groats that have been steamed and flattened into flakes; the “certified gluten-free” label means they’re processed to avoid cross-contact with wheat. Oats are traditional in Northern European and Scottish cooking and have a mild, slightly sweet, toasty flavor and earthy aroma when cooked. Certified GF oats are available in most supermarkets’ natural-foods or cereal aisle and online; substitutes include quick oats (different texture) or oat flour for some recipes, and for strict GF swaps use certified gluten-free quinoa flakes or a GF rolled-oats blend.
Sara's note
"These bars balance a nutty, oat-crumble crust with a bright, gently thickened raspberry layer — chill them well for the cleanest slices. They’re great for gatherings because they travel and slice easily."
Gluten Free Raspberry Crumble Bars
Bright, buttery and unapologetically crumbly, these Gluten Free Raspberry Crumble Bars are the kind of bake that disappears faster than you expect at a potluck. The base and topping are the same oat-forward crumble so every bite balances tender, nutty oats and almond flour with pockets of intensely tart raspberry. The bars bake up with crisp, golden edges and a tender center that holds together just enough to eat by hand — ideal for lunchboxes, picnics, or a casual dessert when you want something that feels homemade but reliably good.
What makes this version work is the little structural choreography: a short par-bake to set the crust, a quick stovetop cook of the raspberries with cornstarch so the filling doesn’t weep, and a light chill to firm the bars for clean slicing. Using a mix of gluten-free all-purpose flour, almond flour and whole rolled oats gives you both crumb and chew, while melted butter binds without weighing the crumble down. It’s designed for home bakers who want gluten-free results that don’t taste like a compromise.
Plan your timing
Ingredients
Instructions
Preheat and prepare the pan
Make the oat-almond crumble
For this step
- 0.5 cupCertified gluten-free all-purpose flour blend
- 0.25 cupAlmond flour (finely ground)
- 1 cupOld-fashioned rolled oats (certified gluten-free)
- 0.5 cupLight brown sugar, loosely packed
- 0.25 teaspoonFine sea salt
- 0.5 cupUnsalted butter, melted and slightly cooled
Press and par-bake the base
Cook the raspberry filling
For this step
- 2 cupsFresh raspberries
- 0.25 cupGranulated sugar (for the filling)
- 1 tablespoonCornstarch
- 1 tablespoonFresh lemon juice
Assemble the bars
Bake, cool and slice
Tips from the kitchen
Par-bake the crust
Don’t skip or shorten the par-bake — it creates a dry surface so the raspberry filling doesn’t soak into the crust and make the bars soggy.
Cool the filling slightly
Spread the raspberry filling when it’s warm but not piping hot; very hot filling can melt the butter in the topping and make it dense.
Measure oats by weight
Scoop-and-leveling rolled oats can vary; for consistent texture, use a kitchen scale (1 cup old-fashioned oats ≈ 90 g).
Reserve crumble for topping
Set aside 1 to 1¼ cups of the mixture before pressing the base so the topping remains loose and crumbly when baked.
Use parchment overhang
Leave a 1–2 inch overhang on two sides to lift the slab from the pan cleanly — it makes chilling and slicing much easier.
Variations & substitutions
Nut-free swap
Replace almond flour with an equal amount of certified gluten-free all-purpose flour plus 2 tablespoons of ground flaxseed for texture to keep this safe for nut-free eaters.
Vegan/dairy-free version
Substitute melted coconut oil or a firm-tasting vegan butter cup-for-cup for the butter; chill slightly before pressing so the base holds together the same way.
Mixed-berry twist
Use a 50/50 mix of raspberries and chopped strawberries or blueberries; increase cornstarch to 1½ tablespoons if using high-moisture berries like strawberries.
Oat-free option
Swap the rolled oats for 3/4 cup extra almond flour plus 1/4 cup finely chopped toasted nuts or seeds and add 2 tablespoons tapioca starch to mimic the chew and binding power.
Storage & make-ahead
Store cooled bars in an airtight container in the refrigerator for up to 5 days; the chill helps the filling stay set and the slices clean. For longer storage, freeze whole or cut bars wrapped tightly in plastic and foil for up to 2 months, thawing overnight in the fridge. To refresh, warm individual bars in a 300°F oven for 6–8 minutes to recrisp the topping.
What to serve with it
Serve room-temperature or slightly chilled with a dollop of lightly sweetened whipped cream, Greek yogurt, or a scoop of vanilla ice cream for dessert. For casual gatherings, arrange on a platter with fresh raspberries and a sprinkling of toasted oats; pair with bright beverages like sparkling water with lemon or an herbal tea to balance the sweetness.
Frequently asked questions
Can I use frozen raspberries?
Yes — thaw and drain excess liquid before cooking, then increase the cornstarch to 1½ tablespoons and cook a little longer so the filling sets properly.
Why does the crust sometimes become soggy?
Sogginess usually comes from underbaking the base or spreading very hot filling onto it; par-bake until set and let the filling cool slightly before assembling to prevent seepage.
Can I use quick oats or oat flour?
Quick oats will produce a softer, less chewy texture and can be used in the same quantity, while oat flour will make the bars denser — if using oat flour, reduce the total flour slightly and expect a different crumb.
How do I get clean, tidy slices?
Chill the bars at least 1–2 hours until the filling firms, then use a sharp knife warmed under hot water and wiped dry between cuts for neat edges.
Is the sugar amount flexible?
Yes — if your raspberries are very tart, keep the 1/4 cup granulated sugar; for sweeter berries you can reduce it to 2 tablespoons, but don't eliminate sugar entirely as it affects both flavor and set.
Ratings & Reviews
Did you make this recipe?
Be the first to share your experience.
Ingredients
- Certified gluten-free all-purpose flour blend0.5 cup
- Almond flour (finely ground)0.25 cup
- Old-fashioned rolled oats (certified gluten-free)1 cup
- Light brown sugar, loosely packed0.5 cup
- Fine sea salt0.25 teaspoon
- Unsalted butter, melted and slightly cooled0.5 cup
- Fresh raspberries2 cups
- Granulated sugar (for the filling)0.25 cup
- Cornstarch1 tablespoon
- Fresh lemon juice1 tablespoon
Nutrition Facts
Per serving: 1 bar (90g)
Nutrition values are estimated from USDA ingredient data and may vary based on preparation, brands, and portion sizes. Values are provided for informational purposes only.
Keep Reading
Guides & articles for this recipe
Tips & Techniques
Seasonal Flavor Framework
A practical guide to composing balanced late-summer plates by pairing charred proteins, smoky accents, bright quick pickles, fresh herbs, and crunchy textures. Includes short technique boxes (quick pickles, finishing oils, compound butters) and clear timing notes so readers can mix-and-match market produce into satisfying meals.
Guides
Late-Summer Sips Guide
An ingredient-first guide to 10–12 late-summer cocktails and mocktails that turn peaches, watermelon, tomatoes, herbs, and stone fruit into vibrant drinks. Covers shrubs, grilled and charred fruit, tea infusions, batch methods, low-ABV swaps, and pairing notes for backyard grills.
Guides
Trending Charred Fruit Finishes
A practical guide to finishing grilled late‑summer fruits—peaches, plums, pineapple, and citrus—using glazes, brûlée sugars, herb‑salt contrasts, cheese pairings, and boozy sauces. Includes step‑by‑step techniques, eight quick finish recipes, and pairing ideas for desserts, salads, and grill‑side cocktails you can make tonight.
More from Baking
View all Baking recipes →Baked Mac and Cheese
Summer Berry Cake
Ricotta Turkey Stuffed Shells
Salted Caramel Popcorn
Gluten Free Lump Crab Cakes with Almond Flour and Lemon Zest
Seafood Baked Pasta
Cheesy Baked Penne with Italian Sausage and Broccoli
Classic Slow-Baked BBQ Baked Beans with Bacon & Molasses (Make-Ahead Labor Day Side)
Buttercream Frosting
Ask me anything about this recipe — substitutions, scaling, techniques, timing.
Powered by AI · Answers may not always be perfect