Gather all ingredients. Preheat the oven to 425 degrees F (220 degrees C). Generously spray a sheet pan with cooking spray.
Mix pancake mix, milk, and eggs together in a large bowl; let sit for 5 minutes.
Pour into the prepared sheet pan. Top with strawberries and blueberries.
Bake in the preheated oven until the center of the pancake is springy to the touch and a toothpick inserted in the middle comes out clean, about 15 minutes.
