Preheat oven to 350°F. Grease a mini muffin tin or line with mini paper liners.
In a large bowl, whisk together 2 cups flour, 1 scoop protein powder (if using), 1/2 cup sugar, 2 tsp baking powder, and 1/2 tsp salt.
In a separate bowl, combine 3/4 cup plant milk, 1/2 cup melted vegan butter (or 1/4 cup butter + 1/4 cup oil), and 4 oz applesauce. Whisk until smooth.
Pour wet ingredients into dry ingredients and stir gently until just combined; do not overmix. Fold in 1 cup vegan white chocolate chips.
Spoon batter into prepared mini cups, filling about 3/4 full.
Bake at 350°F for about 15 minutes, or until a toothpick inserted into a muffin center comes out clean. (If using gluten-free flour, begin checking at 15 minutes.)
Cool in the pan 5 minutes, then transfer to a wire rack to cool completely.