Cook ground beef and onion in large skillet on medium-high heat 5 minutes, stirring occasionally. Drain fat.
Stir in Seasoning Mix and remaining ingredients, except RedHot Sauce. Bring to boil. Reduce heat to low; cover and simmer 10 minutes, stirring occasionally.
Serve with shredded cheese, sour cream and chopped onion, and drizzle with RedHot Sauce, if desired.
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