Add dry and wet ingredients in one large mixing bowl until batter is well combined.
Spoon batter into a greased 12-muffin tin until it's 2/3 full.
Bake for 25-30 minutes or until toothpick in center of muffin comes clean.
Notes
Use muffin liners instead of greasing the muffin tin. If you prefer to make banana bread instead of muffins, pour batter into a greased loaf pan and bake for 45 minutes or until toothpick in center comes clean.