Pizza Supreme Sliders (Easy Party Bake) - My Home Made Recipe

Ingredients

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