Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan or line it with parchment paper.
Mix dry ingredients: In a large bowl, whisk together 1 1/2 cups almond flour, 1/2 cup coconut flour, 1/2 cup coconut sugar, 1 tsp baking powder, 1/2 tsp baking soda, and 1/4 tsp salt.
Combine wet ingredients: In another bowl, mix 1/2 cup melted coconut oil, 3 large eggs, 1/2 cup almond milk, 1/4 cup maple syrup, 1/4 cup fresh lemon juice, and zest of 1 lemon until smooth.
Blend wet and dry: Pour the wet ingredients into the dry ingredients. Stir until just combined.
Add blueberries: Gently fold in 1 cup fresh blueberries.
Prepare topping: In a small bowl, combine 2 tbsp coconut sugar, 1 tsp lemon zest, and 1/4 cup chopped almonds.
Assemble cake: Pour batter into the prepared cake pan, spreading evenly. Sprinkle the topping mixture over the batter.
Bake: Place in the oven and bake for 35 minutes, or until a toothpick inserted into the center comes out clean.
Cool and serve: Let the cake cool in the pan for 10 minutes before transferring to a wire rack. Slice and enjoy!