Step 1

Preheat oven to 350°. Line a rimmed baking sheet with parchment paper and coat with 2 Tbsp. oil. Roll out and stretch dough into baking sheet to just reach edges. Spread sauce evenly over dough, leaving a 1” border; top with basil, oregano, pepperoni, onion, red pepper, spinach, mozzarella, ricotta, Parmesan, and red pepper flakes.

Step 2

Roll dough into a log, starting from a long side and using parchment to help. Pinch dough closed along seam and ends and turn stromboli seam side down. Brush top with 2 Tbsp. oil; sprinkle with salt.

Step 3

Bake stromboli until crust is golden brown, 50–60 minutes. Brush with remaining 1 Tbsp. oil and bake 5 minutes more. Transfer baking sheet to a wire rack and let stromboli cool 10 minutes before slicing.