For the filling
01 -
1 package (12 count) sweet Hawaiian rolls or slider rolls
02 -
1/2 lb (225 g) mild Italian sausage, casings removed if needed
03 -
1/2 cup (75 g) diced green bell pepper
04 -
1/3 cup (50 g) diced red onion
05 -
3/4 cup (55 g) sliced mushrooms, chopped if large
06 -
3/4 cup (180 ml) thick marinara sauce, plus more for serving
07 -
2 cups (225 g) shredded low-moisture mozzarella cheese, divided
08 -
4 oz (115 g) sliced pepperoni
09 -
1/3 cup (45 g) sliced black olives, drained and patted dry
For the garlic Parmesan topping
10 -
3 tablespoons (42 g) unsalted butter, melted
11 -
2 tablespoons grated Parmesan cheese
12 -
1 tablespoon olive oil
13 -
1 small garlic clove, finely minced
14 -
1 teaspoon dried oregano
15 -
1 teaspoon dried parsley
16 -
1/4 teaspoon red pepper flakes, optional
17 -
Nonstick cooking spray or extra butter for the baking dish