In a clean jar or bowl, add rolled oats, creamy yogurt, cake mix, and your choice of milk. Stir thoroughly until the mixture is well combined and smooth.

Drizzle in your preferred amount of maple syrup or honey, mixing well to distribute the sweetness evenly throughout the oat mixture.

Sprinkle in the colorful sprinkles, folding them gently into the oats to prevent clumping.

Cover tightly and refrigerate for at least 4 hours, preferably overnight.

Before serving, stir the oats again and add toppings like fresh banana slices or extra sprinkles as desired.