Preheat oven to 350’ degrees.
Coat a 9x13 casserole dish with non-stick baking spray.
In a large skillet add the diced onion, beef, and garlic. Stir to combine.
Cook for 5-6 minutes over medium heat. Drain the fat.
In a small bowl add the soup, milk, and sour cream, mix to combine.
Pour the soup over the meat mixture, to mix to combine. Add the corn, and black beans to the meat mixture, stir to combine.
Place a layer of tater tots on the bottom of the casserole dish.
Top the tater tots with ½ of the meat mixture. Spread the meat mixture evenly over the tater tots.
Top with ½ of the shredded cheese. Repeat the steps.
Bake in the oven for 30 - 35 minutes. Remove from the oven and allow to cool.
Enjoy!