Place ground beef in a large, deep skillet. Cook over medium high heat until evenly brown. Drain and mix in taco seasoning mix and water. Continue cooking 5 minutes. Remove from heat.
Place processed cheese and milk in a small, microwave safe bowl. Microwave on high until melted, 1 to 2 minutes. Stir until blended and smooth.
Place tortilla chips on a large, microwave safe dish. Spread with refried beans. Top with beef and cheese and mixtures.
Microwave approximately 2 minutes on high, until the cheese has melted into the beef. Top with tomato and green onions. Serve warm.
