01 -
Preheat your oven to 375°F. Move the rack to the top third of the oven for best browning results.
02 -
Bring a large pot of water to a boil and add salt. Cook the penne for 2 minutes less than the package directions suggest (it will continue cooking in the oven). Drain when done.
03 -
Return the drained pasta to the pot. Add the marinara sauce and about 1/3 of the pepperoni slices. Stir everything together until the pasta is evenly coated.
04 -
Transfer the pasta mixture to a 9x13 inch baking dish, spreading it out in an even layer. Sprinkle the shredded mozzarella evenly over the top, then arrange the remaining pepperoni slices over the cheese.
05 -
Bake uncovered for 20 minutes until the cheese is melted and bubbly. Then switch to broil for 2-3 minutes to crisp up the pepperoni and cheese. Watch carefully to prevent burning!