1 1/2 cups old-fashioned rolled oats (or quick-cooking oats)
1/3 cup to 1/2 cup milk (or heavy cream) such as dairy milk, almond, cashew or coconut milk
1/3 cup to 1/2 cup old-fashioned rolled oats
1/3 cup to 1/2 cup yogurt, optional
1 teaspoon chia seeds, optional but highly recommended
1/2 banana, mashed, optional
2 tbsp unsalted butter