Preheat Oven: Set it to 350°F (175°C). Grease or line a 9-inch cake pan with parchment paper.
Mix Dry Ingredients: In a large bowl, combine 1 1/2 cups almond flour, 1/2 cup coconut flour, 1 tsp baking powder, 1/2 tsp baking soda, and 1/2 tsp salt.
Blend Wet Ingredients: In another bowl, whisk together 1/4 cup melted coconut oil, 1/2 cup applesauce, 3 large eggs, 1 tsp vanilla extract, and 1/2 cup maple syrup or honey.
Combine: Stir the wet mixture into the dry ingredients until just blended.
Prepare Streusel: In a small bowl, mix 1/2 cup chopped pecans, 1/4 cup almond flour, 2 tbsp coconut sugar, 2 tbsp melted coconut oil, and 1/2 tsp ground cinnamon.
Assemble: Pour the batter into the prepared pan. Evenly sprinkle the streusel topping over the top.
Bake: Bake for 40 minutes or until a toothpick inserted into the center comes out clean.
Cool and Serve: Allow the cake to cool in the pan for 10 minutes before transferring to a wire rack. Slice and indulge!