Peanut Butter Banana Overnight Oats

1 cup old-fashioned rolled oats

1 cup milk of choice (kefir, almond milk, regular milk, etc.)

1 ripe banana, mashed (⅓-½ cup)

2 Tbsp. peanut butter

1 Tbsp. pure maple syrup

1 Tbsp. flax meal or chia seeds (or ½ Tbsp. of each)

½ tsp. pure vanilla extract

Pinch of salt

For optional toppings: sliced bananas, peanut butter, chopped nuts, etc.