Preheat the oven to 350°F (175°C) and grease a muffin tin or line it with muffin liners.

In a mixing bowl, combine all the dry ingredients and whisk together until well mixed.

In another bowl, mix together the wet ingredients until smooth.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Fold in the protein powder until fully incorporated.

Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full.

Bake in the preheated oven for 18-20 minutes or until a toothpick inserted in the center comes out clean.

Allow the muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely.