Good-Cooking - Beef with a Cornbread Blanket

Ingredients

• 1 pound ground beef
• 1 onion, chopped
• 1/2 green bell pepper, chopped
• 2 (10 ounce) cans condensed cream of celery soup
• 1 tablespoon prepared mustard
• Salt and pepper, to taste
• 1 package Jiffy cornbread mix