Preheat oven to 375º Farenheit and spray 20 standard-sized muffin cups with non-stick spray.
Add all of the ingredients to a large bowl and mix until completely incorporated.
Use a large scoop to transfer the muffin batter to your prepared standard muffin pan.
Bake 18-20 minutes or until done.
Cool 5 minutes in the pan (tilt the muffins slightly on their sides to release some steam) then remove from the pan and cool completely on a wire rack.
Enjoy warm or room temperature. Store leftover muffins in an airtight container at room temperature for up to 4 days.
Video
Notes
I used Betty Crocker Yellow Cake Mix, not Butter Yellow.