Preheat the oven to 450 degrees F (230 degrees C).
Place potato nuggets on a baking sheet in an even layer and bake until lightly browned and crisp, about 20 minutes.
Remove from the oven and top with gravy, diced ham, Swiss cheese, and Cheddar cheese. Return to the oven and bake until cheese is melted, about 5 minutes.
Top with crumbled bacon and chives. Scatter cheese curds around and serve immediately.