Triple-Cheese Skillet Shells
YIELDS:6 PREP TIME:0 hours 5 mins TOTAL TIME:0 hours 20 mins Ingredients 12 oz. medium shell pasta 1 tbsp. olive oil 1 onion, finely chopped Kosher salt pepper 1 clove garlic, finely chopped 1 tbsp. flour 1 1/2 c. whole milk 4…