Preheat the oven to 350 degrees F (230 degrees C). Grease a 2-quart square baking dish.

Cook bacon in a large skillet until crisp, about 8 minutes. Drain on paper towels. When cool enough to handle, crumble bacon. Drain all but 2 tablespoons bacon drippings from the skillet.

Add onion to the skillet. Cook and stir until tender, about 5 minutes.

Add flour and cayenne pepper to skillet; cook and stir for 1 minute.

Add 2 cups milk to the skillet. Cook and stir until thickened and bubbly, about 3 minutes.

Gradually add 1 cup cheese to the skillet, stirring until melted. Stir in half of green onions.

Place 1/2 cup sour cream in a small bowl. Gradually whisk in about 1/2 cup of hot sauce mixture. Return mixture to the skillet. Return to a simmer.

Add half of tots to the prepared baking dish. Top with half of sauce and half of bacon. Top with remaining tots, remaining sauce, remaining bacon, and remaining cheese.

Bake until bubbly and cheese on top is lightly browned, about 35 minutes.

For dill cream, whisk together 1/4 cup sour cream, 1 tablespoon milk, and dill.