Heat a large pot (6 to 8-quart) over medium-high heat. Add the ground beef and break it apart with a wooden spoon. Cook for 7 to 8 minutes, stirring occasionally, until completely browned with no pink remaining.
Pour in stewed tomatoes, ROTEL, black beans, pinto beans, and corn with all their liquid. Sprinkle both seasoning packets over the top and stir thoroughly. Let the mixture come to a gentle boil for about 2 minutes.
Add both 12-ounce bags of frozen vegetables directly from the freezer. Reduce heat to medium-low and simmer uncovered for 6 to 8 minutes, stirring every 2 minutes.
Turn heat to low (keep warm, not off). Add cream cheese cut into 1-inch cubes and stir continuously for 2 to 3 minutes until completely melted. Gently fold in Greek yogurt until soup is velvety smooth and uniform.
Notes
Use 96/4 or 93/7 lean ground beef for the healthiest option. Ground turkey works too with 1 tablespoon olive oil added.
Let cream cheese and Greek yogurt sit at room temperature for 30 minutes before adding to prevent lumps and curdling.
Don’t drain canned vegetables as the liquid adds essential flavor depth to the broth.