Whisk together the pancake mix, milk, and eggs in a large bowl.
Pour the batter onto the prepared baking sheet and spread it to the edges.
Arrange all of the berries onto the batter.
Transfer the baking sheet to the oven and bake for 15 minutes.
Slice and serve with your favorite toppings like syrup or whipped cream.
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Notes
Let the pancakes cool for a few minutes before slicing. This helps them set up and makes cutting clean squares much easier.
If you're feeding picky eaters, add different toppings to separate areas of the batter, such as berries on one side and chocolate chips on the other, so that everyone gets their favorite flavor without making multiple batches.
The recipe makes 4-6 servings but the nutrition is based off of 5 servings.
If freezing the sheet pan pancakes, do so in individual portions separated by layers of parchment paper to make it easier to reheat.