01 - Preheat the oven to 350°F. Line an 8x8-inch baking pan with parchment paper, allowing overhang for easy removal.
02 - In a large bowl, stir together rolled oats, protein powder, ground cinnamon, ginger, nutmeg, baking powder, and salt until evenly mixed.
03 - In a separate bowl, whisk the eggs, maple syrup or honey, melted coconut oil, and vanilla extract until the mixture is smooth and uniform.
04 - Pour the wet ingredients into the dry ingredients. Stir until just combined, avoiding overmixing.
05 - Fold in the grated carrots, chopped nuts, and optional raisins, ensuring even distribution throughout the batter.
06 - Spread the batter evenly in the lined baking pan, smoothing the top with a spatula.
07 - Place the pan in the oven and bake for 22 to 25 minutes, or until the surface is golden brown and a toothpick inserted in the center emerges clean.
08 - Allow the bars to cool completely within the pan before lifting out and slicing into 12 equal pieces.