Sausage Potato Casserole With Roasted Red Peppers – Lodge Cast Iron

Ingredients

• 1 tablespoon butter
• 2 large onions, thinly sliced
• 4-5 hot sausage links, casings removed
• 6 medium-sized russet potatoes, peeled and thinly sliced
• 1, 12-ounce jar sliced roasted red peppers, drained
• 2 tablespoons olive oil
• 1 cup grated parmesan or mozzarella cheese
• Sea salt and freshly ground black pepper