Rosemary Pepper Steak Pasta

WHAT YOU'LL NEED

• 1 Tbsp. olive oil
• 1 lb. boneless sirloin steak, sliced
• 3 red, orange and/or yellow bell peppers, seeded, thinly sliced, (3 cups)
• 1 large onion, thinly sliced, (1 1/2 cups)
• 1 package Knorr® Italian Sides™ - Creamy Garlic Shells
• 1/2 tsp. chopped fresh rosemary leaves