Combine all ingredients in a bowl, or a 16 ounce mason jar. Stir to combine. Let oats sit for five minutes, then stir again (this helps prevent the oats and chia seeds from settling on the bottom).
1/4 cup old-fashioned oats, 1/4 cup Greek yogurt, 1/2 cup milk, 1/4 cup pumpkin puree, 1 tablespoon chia seeds, 1/2 teaspoon pumpkin pie spice, 1 scoop vanilla protein powder