In a large mixing bowl, whisk the cake mix, milk, vegetable oil, and eggs until just combined.
Heat a large griddle or skillet over medium-low heat, coating with cooking spray or butter. (Because the cake mix contains a good amount of sugar, cooking too hot can cause them to burn.) When the pan is hot, pour the batter using about ¼ cup for each pancake.
Brown the pancakes on both sides, about 2 minutes each. It's about time to flip when bubbles form and pop on the surface.
Top with whipped cream and rainbow sprinkles and serve with pancake syrup or maple syrup (optional).
Notes
Storage: To store leftover pancakes, allow them to cool completely at room temperature, then transfer them to an airtight container. Store them in the refrigerator for up to 3-4 days or in the freezer for 1-2 months.