Stir, then cover it tightly with tin foil. Place in the oven for 25 minutes (she doesn’t say what temp to set your oven at, but 375 should do).
After 25 minutes, carefully remove the foil and add shredded cheese as well as a few more pepperoni.
Put it back in the oven until your cheese is bubbly (so, like, 10 more minutes). Then you’re done!