Preheat oven to 350°F. Prepare a standard muffin tin with paper liners.
In a large bowl, whisk flour, oats, baking powder, salt and baking soda. Add brown sugar, sunflower butter, milk, vegetable oil and egg until well incorporated. Fold in chocolate chips.
Divide batter among muffin tin liners. Bake 20-25 minutes, or until a toothpick inserted in the center comes out clean.
Allow to cool slightly, then serve.
Store leftovers in an airtight container in the refrigerator.