Spray your crockpot with non-stick spray. Add tater tots to the bottom of the crockpot and evenly spread them out.
Brown the hamburger meat, onions, bell peppers, and shishito peppers in a cast iron skillet or pan. When the meat is brown, drain the fat.
Add diced tomatoes to the meat mixture and combine.
Pour the meat mixture over the tater tots creating a layer.
In a small bowl, mix the sour cream, salt, pepper, and onion powder. Add approximately 4 oz of cheese (save the remainder of the cheese for the top layer at the end).
Spread the sour cream mixture over the meat mixture.
Cover and cook on low for approximately 4 to 4/12 hours. Keep the lid closed during the cooking time.
After cooking is done, add the remaining cheese over the top for a final layer.
Cover for another 10 minutes or until the cheese is melted.
When ready to serve, you can top with salsa, green onions, or a topping of your choice.