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Preheat the oven to 425°F and line a 12-count muffin tin with paper cupcake liners.
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In a large bowl, whisk together the flour, oats, baking powder, baking soda, cinnamon and salt.
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Make a well in the center over the dry ingredients and add the egg, applesauce, brown sugar, avocado oil and vanilla extract.
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Whisk together, and then incorporate into the dry ingredients. Switch to a rubber spatula to fold everything together to create a cohesive batter. Don’t overmix.
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Scoop the batter into the 12 muffin cavities, about 1⁄4 cup batter per muffin.
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Sprinkle each muffin with extra oats and demurara sugar.
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Bake for 5 minutes at 425°F, then reduce the oven temperature to 350°F and bake an additional 16-18 minutes. A toothpick inserted into the center should come out clean when the muffins are ready.
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Allow muffins to cool for 10 minutes in the pan before transferring to a wire rack to cool completely.