1. Preheat your oven to 375 F (190 C). Lightly grease a 12-cup muffin tin with cooking spray, or line it with paper liners.

2. In a large mixing bowl, whisk together the rolled oats, protein powder, almond flour, baking powder, cinnamon, and salt. Make sure there are no lumps and all the ingredients are evenly distributed.

3. In a separate medium bowl, whisk together the unsweetened applesauce, milk, eggs, and maple syrup (or honey) until smooth and well combined.

4. Pour the wet ingredient mixture into the dry ingredient mixture. Stir gently with a spatula or wooden spoon until just combined. Be careful not to overmix, as this can lead to tougher baked goods. A few small lumps are perfectly fine.

5. Gently fold in your chosen mix-ins, such as chocolate chips, dried cranberries, or chopped nuts. Distribute them evenly throughout the batter.

6. Divide the batter evenly among the 12 prepared muffin cups. Fill each cup about two-thirds full.

7. Place the muffin tin in the preheated oven and bake for 20-25 minutes, or until a wooden skewer or toothpick inserted into the center of a snack comes out clean. The tops should be lightly golden brown.

8. Remove the muffin tin from the oven and let the snacks cool in the tin for about 5 minutes before transferring them to a wire rack to cool completely. This helps them set and prevents them from becoming soggy.