Storage: Keep in an airtight container in the fridge for up to 5 days, layering with parchment if stacked. To freeze, wrap individual bars in plastic then store in a freezer bag for up to 2 months. Thaw overnight in the fridge or reheat gently in the microwave.
Swaps: Try mixed berries, add vanilla or almond extract, stir chopped nuts into the topping, or substitute a 1-to-1 gluten-free flour blend. Frozen strawberries work but should be thawed and drained—add more cornstarch to compensate for extra moisture.