Preheat oven to 350 degrees F and spray a muffin tin with cooking spray. Set aside.
In a large mixing bowl, combine almond flour, tapioca flour, oat flour, coconut sugar, cinnamon, baking soda, and salt.
In a separate mixing bowl, whisk sweet potatoes, butter, eggs, and milk until smooth.
Pour wet ingredients into the large bowl of dry ingredients. Whisk until smooth.
Evenly spoon about ¼ cup of muffin batter into each muffin liner – this recipe makes 14 muffins.
Stir together crumble ingredients and evenly sprinkle the top of each muffin with about 1 tablespoons of crumble mixture.
Bake in the oven for 14-16 minutes, or until center of muffins are cooked completely.
Let muffins cool for 10 minutes and enjoy!
Store muffins in the fridge for up to 3 days or in the freezer for up to 2 months.