In a large mixing bowl, combine your dry ingredients: almond flour, protein powder, and baking powder. In another bowl, whisk together the wet ingredients: eggs, maple syrup, and vanilla extract. Pour the wet mixture into the dry ingredients and stir gently until just combined.

Prepare a donut pan by greasing it lightly. Transfer the batter into a plastic bag, cut a small hole in one corner, and pipe the batter into each cavity of the donut pan, filling them about three-quarters full.

Preheat your oven to 350°F (175°C). Place the filled donut pan in the oven and bake for approximately 18 minutes. They’re done when a toothpick inserted comes out clean.

Let the donuts cool in the pan for 5 minutes. After, carefully transfer the donuts to a wire rack to cool completely.

If desired, melt dark chocolate in a microwave-safe bowl and drizzle it over the cooled donuts.