Creamy Slow Cooker Tomato & Mushroom Sauced Round Steak

Place onions in bottom of slow cooker.

Melt 1 tablespoon butter in 10-inch skillet until sizzling; add half of beef. Cook over medium-high heat, turning once, until browned (3 to 5 minutes). Place beef in slow cooker. Repeat with remaining butter and beef.

Combine tomatoes, soup, marjoram, pepper and garlic powder in small bowl. Pour tomato mixture over beef in slow cooker. Cover; cook on Low heat setting for 8 to 10 hours, or on High heat setting for 4 hours or until meat is tender.

Increase heat setting to High 20 minutes before serving. Combine flour and cold water in small bowl. Stir flour mixture into beef mixture. Cover; continue cooking 20 minutes or until juices are thickened.

To serve, spoon beef mixture over hot cooked noodles, if desired.