Adjust oven rack to the lowest position and preheat to 425°F.
Lightly spray a rimmed 10×15-inch baking pan with nonstick cooking spray.
In a large bowl, combine flour, Italian seasoning, salt, and pepper.
Add eggs and milk.
Stir until the mixture is well combined and smooth.
Pour the batter into the prepared baking pan, spreading it evenly to cover the bottom.
Arrange pepperoni slices evenly over the batter.
Bake in the preheated oven for 20 minutes.
Remove the pan from the oven.
Spread pizza sauce evenly over the baked crust.
Sprinkle cheese over the sauce.
Return the pan to the oven and bake for an additional 10-15 minutes, or until the crust is golden brown and the cheese is hot and bubbly.
Remove from the oven and let cool for a few minutes.
Slice and serve hot, garnished with parsley.