01 -
Combine rolled oats and whole milk in a medium bowl. Let soak for at least 15 minutes to soften the oats and ensure a moist texture.
02 -
In a large bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, nutmeg, brown sugar, and rolled oats until evenly combined and smooth.
03 -
Lightly beat the egg in a separate bowl, then whisk in vegetable oil and vanilla extract until homogenous.
04 -
Add the soaked oats and wet ingredients to the dry mixture. Gently fold until just combined to avoid overmixing.
05 -
Fold in the finely chopped Honeycrisp apples, distributing them evenly throughout the batter.
06 -
Divide batter evenly into a greased or lined 12-cup muffin tin. Bake at 375°F (190°C) for 18 to 22 minutes, or until a toothpick inserted in the center comes out clean.
07 -
Allow muffins to cool in the pan for 5 minutes before transferring to a wire rack to cool completely. Serve warm or at room temperature.