Moist Gluten-Free Banana Bars with Oat Crust

Gluten Free Banana Bars with Cream Cheese Frosting are soft, tender, and bursting with banana flavor. They’re incredibly simple to prepare and topped with a smooth, slightly tangy cream cheese frosting that balances the cake’s sweetness. These bars work well for snacks, dessert, or a special breakfast treat and are easy to slice and share. Follow the notes and instructions below for reliable results.

Recipe Ingredient Notes

Gluten-free flour: This recipe was tested with several gluten-free all-purpose blends and produced a tender, even crumb. Use a commercial blend labeled as multipurpose or 1-to-1 and check whether it includes xanthan gum; if it does not, add ¼ teaspoon xanthan gum to the dry ingredients for better structure.

Bananas: Use ripe bananas with brown spots for maximum sweetness and banana flavor. Riper bananas have more sugar and mash more easily, which helps create a moist, tender batter and enhances the cake’s natural banana taste.

Oil: Using oil instead of butter keeps the bars moist and tender even after cooling, because oil remains liquid at room temperature.

Cream cheese: For the frosting, choose full-fat block-style cream cheese for the creamiest texture and best flavor.

How to make Banana Bars

You don’t need a stand mixer for the cake batter—everything can be mixed by hand with a whisk and spatula. A hand mixer is useful for the cream cheese frosting to achieve a light, airy texture. An 8×8-inch square pan is recommended; if you use a 9×9-inch pan, the bars will bake faster, so reduce baking time and check for doneness earlier.

1. Preheat the oven to 350°F and line an 8-inch square pan with parchment paper, leaving an overhang to lift the bars out after baking.
2. In a small bowl, whisk together the gluten-free flour blend, baking powder, baking soda, ground cinnamon, and kosher salt. Set aside.
3. In a large bowl, mash 250 grams (about 2–3) very ripe bananas with a fork until smooth.
4. Add the brown sugar, granulated sugar, room-temperature eggs, oil, and vanilla extract. Whisk until combined and smooth.
5. Fold the dry ingredients into the wet mixture with a spatula until just combined; avoid overmixing to keep the bars tender.
6. Transfer the batter to the prepared pan and smooth the top with a spatula or spoon.
7. Bake in the preheated oven for 35–40 minutes, or until a toothpick inserted in the center comes out clean. The top should be golden brown. Note: baking time varies by pan size and oven—this timing is for an 8-inch square pan.
8. Remove from the oven and cool on a wire rack. Let the bars cool in the pan for 10 minutes, then lift them out using the parchment overhang and allow to cool completely before frosting.

Cream Cheese Frosting (Small Batch)

Make sure the butter and cream cheese are at room temperature for the smoothest, creamiest frosting.

1. In a medium bowl, beat room-temperature unsalted butter, full-fat cream cheese, a pinch of kosher salt, and a teaspoon of vanilla extract until light and fluffy.
2. Gradually add powdered sugar, mixing until the frosting is smooth and airy. Scrape down the bowl as needed and taste to adjust sweetness.
3. If the frosting is too thick, thin with 1 tablespoon milk (dairy or non-dairy) until you reach the desired consistency.
4. Spread the frosting over the completely cooled banana bars by dropping it into the center and smoothing outward with an offset knife or spoon.
5. Chill the frosted bars in the refrigerator for 15–30 minutes to set the frosting, which makes slicing neater.

Garnish Ideas for Gluten Free Banana Bars

Enhance flavor and texture with simple toppings:

• Chopped nuts: Walnuts, pecans, or almonds add crunch and contrast nicely with the soft bars.
• Sliced bananas: Fresh banana slices on top highlight the banana flavor and create an attractive presentation.
• Cinnamon sugar: A light dusting of cinnamon sugar adds warmth and a subtle crunch to the frosting.

Storage & Freezing

Store leftover frosted banana bars in an airtight container in the refrigerator for up to 4 days. Because of the cream cheese frosting, refrigeration is recommended. The oil-based bars stay moist even when chilled; if you prefer softer frosting, let slices sit at room temperature for a short while before serving.

You can freeze frosted slices for up to one month; the frosting holds up well in the freezer. The unfrosted banana cake can be frozen for up to two months—wrap it tightly to prevent freezer burn and thaw in the refrigerator before frosting.

Note about Salt in my Recipes

Salt types vary in intensity by brand. If you use a different kosher or table salt than the one used for testing, you may want to adjust the amount slightly to taste. Start with the recommended amount and modify in future bakes if necessary.

Baking by Weight

Baking by weight yields consistent results. If you can, weigh ingredients using a digital scale for more accurate measurements—especially important with gluten-free flours, which can vary in density compared with wheat flours.

Note about Ovens and Temperatures

This recipe was developed using a conventional oven with the rack placed in the middle. If you bake with convection (fan) settings, monitor the bake closely and reduce the temperature or time as needed since convection ovens can brown and dry items faster.

Substitutions and Modifications

Ingredient swaps—such as alternative sweeteners, non-dairy creamer in the frosting, or different flours—may change texture and flavor. The recipe published here reflects tested quantities and techniques; adjust carefully and note changes so you can replicate results you like.