Turkey Melt

Ingredients

• 3 tablespoons olive oil, divided
• 1 yellow onion, sliced
• 2 cups thinly sliced button mushrooms
• ½ red bell pepper, cut into thin strips
• ½ green bell pepper, cut into thin strips
• Salt and pepper to taste
• 1 (16-ounce) package JENNIE-O® Lean Ground Turkey, formed into 4 patties
• 2 cups shredded mozzarella cheese, divided
• ½ stick unsalted butter
• 8 slices sourdough bread