Thoroughly rinse canned black beans and pat them completely dry to remove excess starch, which prevents a gummy texture and ensures fudgy brownies with the perfect crumb structure.

Whisk cocoa powder with a small amount of hot water or melted coconut oil before adding to the batter to intensify chocolate flavor and eliminate any bitter, raw cocoa taste.

Use a food processor and pulse the black beans just until mostly smooth with tiny visible pieces remaining—over-blending creates a dense, cake-like texture instead of rich, fudgy brownies.

Lightly coat your gluten-free rolled oats with a bit of coconut oil before blending into flour to enhance binding and create a sturdier crumb that holds the brownies together without crumbling.

Remove brownies when a toothpick inserted in the center still has moist crumbs clinging to it—they'll continue cooking as they cool, resulting in decadent, fudgy centers rather than dry cake-like brownies.