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Cook frozen potatoes according to package directions.
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Prepare taco meat (if not using leftovers).
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Meanwhile, prepare 1/2 batch of guacamole using recipe on side of can.(Be sure not to drain all the liquid from the can. You'll need 1/2 the liquid for your queso dip!)
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Use the diced green onion for guacamole, saving tops for later. Mash avocado and mix with green onion, lime juice and salt. Stir in 1/2 can of Ro*Tel.
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Prepare Queso Dip and microwave the other 1/2 can Ro*tel (undrained) and Velevetta cups. Microwave in intervals for 3 mins, stirring often or until cheese is fully melted.
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Layer crispy potato rounds in large dish. Pour hot queso over the top. Layer with refried beans, taco meat, lettuce, guacamole and sour cream. Top with tomatoes and scallions.
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Serve immediately.