Stuffed Chicken Breast with Spinach & Cheese | Cooking Professionally

Ingredients

• 4 chicken breasts, boneless and skinless
• 1 teaspoon kosher salt, divided
• 4 ounces cream cheese, room temperature
• 2 ounces mozzarella cheese, shredded
• 1 (10 ounce) box frozen spinach, thawed and squeezed to remove excess moisture
• 1/2 small sweet onion, grated
• 1 clove garlic, minced
• 2 tablespoons olive oil
• 1 tablespoon unsalted butter