Mix blueberries with corn starch, brown sugar, vanilla extract and lemon juice. Place blueberries in a baking pan (or cast iron skillet). We used two single-serving ceramic molds.
Prepare the almond crumble: mix ingredients together and combine with your fingers until the mixture resembles coarse breadcrumbs. Sprinke the crumble on top of the blueberries.
Place baking pan into preheated oven and bake for about 30 minutes, until the crumble turns golden brown and the blueberries dissolve. Remove from oven and let it cool down a bit.