Preheat the oven to 375°F. Spray a 9x13 baking dish with nonstick cooking spray.

In either a nonstick skillet or a 3-4 quart saucepan over medium-high heat, brown the ground beef, chopped onion, and minced garlic, stirring often. Continue cooking until the ground beef is cooked through and no longer pink. This should take about 5 to 7 minutes. Drain any excess oil from the beef.

Layer the cooked ground beef mixture in the bottom of the sprayed baking dish.

Next, in a medium-sized mixing bowl, whisk together the undiluted soup, sour cream, milk, kosher salt, onion powder, and black pepper until well incorporated.

Stir in ½ cup of the shredded mild cheddar cheese and both cans of drained green beans until completely combined. Be careful when stirring to not crush the green beans.

Spoon the soup mixture over the layer of ground beef.

Sprinkle the remaining 1 ½ cups of shredded cheese over the soup layer.

Finally, arrange the Tater Tots over the top of the cheese layer. Bake for 45 to 50 minutes until the tots are golden brown and the sauce is bubbling. Serve while hot.