01 - Preheat the oven to 350°F. Lightly grease or line a 9x5-inch loaf pan with parchment paper.
02 - In a large mixing bowl, whisk together whole wheat flour, whey protein powder, light brown sugar, ground cinnamon, baking powder, baking soda, and salt. Fold in the raisins.
03 - In a separate bowl, whisk together unsweetened almond milk, Greek yogurt, eggs, melted coconut oil, and vanilla extract until smooth.
04 - Pour the wet ingredients into the dry ingredients and gently stir until just combined. Avoid overmixing to preserve bread texture.
05 - Spoon the batter into the prepared loaf pan and smooth the surface evenly.
06 - Bake for 30 to 35 minutes, or until a toothpick inserted in the center emerges clean.
07 - Allow bread to cool in the pan for 10 minutes. Transfer to a wire rack and cool completely before slicing into servings.