Unstuffed Peppers

No need to fuss with seeding and stuffing whole peppers. Get the same comforting flavor more easily by chopping the peppers. Then, for a simple and fun presentation, spoon into lettuce cups.
1.25 lb. extra lean ground beef
1 cup diced onion
1 carton (24 oz.) College Inn® Hearty Beef Simple Starter® Sauce
1 can (14.5 oz.) petite diced tomatoes, not drained
1 cup uncooked long grain white rice
1 1/2 tsp. dry oregano
1/2 tsp. garlic powder
3 cups chopped bell peppers (1 cup EACH red, yellow and green bell peppers), cut into 1-inch pieces
Toppings: White cheddar, parsley, green onion
Electric Pressure Cooker