Step 2
Heat oil in a large skillet over medium-high heat. Add burgers and cook, 4 to 5 minutes for medium. Flip patties, then immediately pour 2 cups marinara around them in the pan. Reduce heat to medium-low and simmer for another minute, then top each with cheese and pepperoni slices. Cover pan and cook until cheese is melty and the burger is cooked to your liking, about 3 minutes more.