Preheat your oven to 425 degrees F.
Heat a 10-inch cast iron pan to medium heat. Add 1 tablespoon butter and let it melt.
Add the onion, peppers, celery and cubed potatoes. Cook down for about 5 minutes to soften.
Add the garlic and cook another minute, stirring.
Add the remaining butter and let it melt through. Add the flour and stir to incorporate.
Reduce the heat to medium-low and keep stirring until the flour butter mixture (roux) browns a bit, about 5 minutes.
Add the chicken broth, paprika and salt and pepper. Stir continuously until it thickens up, about 5 minutes.
Stir in the corned beef and sour cream (or heavy cream), then top the whole thing with shredded cheese.
Top with tater tots and bake for 25 minutes, or until the tots are crispy brown.
Serve it up! Drizzle with Homemade Thousand Island Dressing, if desired.