Gluten Free Blueberry Crumble Bars - These gluten free blueberry crumble bars are super easy to make, and they work great with both fresh and frozen blueberries. The combination of the buttery, melt-in-the-mouth lemon shortbread with the juicy, jammy blueberry filling is INCREDIBLE, and you’d never know that they’re both gluten free AND egg free!! Crumb bars. Gluten free recipes. Gluten free desserts. Blueberry bars. Blueberry recipes. Easy dessert ideas.