Avoid instant oats and steel cut oats. They’ll absorb too much moisture and turn into a paste. You need to use old-fashioned oats.
Add all of the ingredients to a large bowl. Stir until completely combined.
Cover the bowl and place it in the refrigerator overnight. You can also scoop it into individual containers or mason jars.
Scoop 1/2 cup of overnight oats into a bowl in the morning. Sprinkle in your favorite toppings and enjoy!