Costa Rican Inspired Stuffed Peppers

Ingredients

• – 4 red bell peppers
• – 1/2 cup plus 1 tablespoon vegetable oil, divided
• – 1 cup 1/4-inch diced white onion (about 1 medium)
• – 4 cups 1/4-inch diced cremini or brown mushrooms (about 1 pound)
• – 1 teaspoon garlic salt
• – 1 teaspoon black pepper
• – 1 cup shredded Oaxaca cheese
• – Cooked white rice, for serving