Preheat oven to 350F. Line a 9×9-inch pan with parchment paper and set aside.
Combine the maple syrup, vegetable oil, eggs and vanilla. Mix well to combine and set aside.
In a separate bowl, mix protein powder, almond flour and cocoa powder.
Pour the wet ingredients on top of the dry ingredients and mix until smooth.
Transfer to a parchment-lined pan. Sprinkle peanuts and pecans on top and bake for 20 to 25 minutes or until a toothpick inserted in the center comes out clean.
Let cool for 30 minutes then cut into squares and enjoy.
Store brownies in an airtight container.