Pizza-Flavored Stuffed Mushrooms

Ingredients

• 24 white mushrooms (1½ to 2 inches in diameter)
• 2 tablespoons extra-virgin olive oil
• 2 tablespoons balsamic vinegar
• 1 1/4 teaspoons table salt, divided
• 1 teaspoon pepper, divided
• 12 ounces hot Italian sausage, casings removed
• 3 ounces whole-milk mozzarella cheese, shredded (3⁄4 cup)
• 1/4 cup chopped fresh basil
• 1/4 cup panko bread crumbs
• 1/4 cup finely chopped pepperoni
• 3 tablespoons white wine
• 1 tablespoon tomato paste
• 3 garlic cloves, minced
• 1/2 teaspoon Italian seasoning
• 1/4 cup grated Parmesan cheese