Preheat the oven to 350°F and line an 8x8-inch baking pan with parchment paper.
In a bowl, whisk together the almond flour, coconut flour, baking powder, and salt.
In another bowl, mix the melted coconut oil, maple syrup, lemon zest, lemon juice, eggs, and vanilla.
Combine the wet and dry ingredients until just mixed—don’t overthink it.
Toss the blueberries with cornstarch and gently fold them into the batter.
Pour the batter into the pan, smoothing the top evenly.
Bake for 25–30 minutes or until the edges are golden and a toothpick comes out clean.
Let them cool completely before cutting. The hardest part is waiting, I know.