Preheat & Prepare: Preheat oven to 350°F (175°C). Grease a 9-inch round cake pan.
Mix Dry Ingredients: In a bowl, whisk almond flour, all-purpose flour, cocoa powder, baking powder, and salt.
Whisk Wet Ingredients: In another bowl, beat eggs, sugar, melted butter, orange juice, zest, and vanilla until smooth.
Combine: Gradually fold the dry ingredients into the wet mixture until just combined.
Add Extras: Stir in dark chocolate chunks. Pour batter into the pan and sprinkle sliced almonds on top.
Bake: Bake for 30-35 minutes, or until a toothpick inserted comes out with a few crumbs.
Cool & Serve: Let cool in the pan for 10 minutes, then transfer to a wire rack.