1.Crumble Beef Into A Large Microwave-Safe Bowl; Stir In Onion. Cover And Microwave On High For 4-1/2 To 6 Minutes Or Until Meat Is No Longer Pink, Stirring Every 1-1/2 Minutes; Drain. Stir In The Tomato Paste, Water And Taco Seasoning. Cover And Cook On High For 2-3 Minutes Or Until Heated Through, Stirring Once. 2.Spoon About 1/3 Cup Meat Mixture Down The Center Of Each Tortilla; Roll Up Tightly. Place Seam Side Down In A Greased Shallow 2-1/2-Qt. Microwave-Safe Dish. Set Remaining Meat Mixture Aside. In A Microwave-Safe Bowl, Combine Cheese Sauce And Chilies. Cover And Microwave On High For 50 Seconds; Stir. Pour Over Tortillas. 3.Spoon Remaining Meat Mixture Down The Center Of Tortillas. Cover And Cook On High For 4 To 4-1/2 Minutes Or Until Heated Through. Let Stand For 5 Minutes Before Serving.