Preheat oven per directions on the waffle fries package. Spread fries out on a baking sheet and season with ½ teaspoon onion powder, ½ teaspoon paprika, ½ teaspoon salt and 1 teaspoon ground black pepper. Bake according to package directions and add 5 minutes to get them crispier. Set aside.
Adjust oven temperature to 400 degrees F.
Over medium heat, melt 4 tablespoons unsalted butter in a medium saucepan. Add 3 tablespoons flour and whisk until well combined.
Add 1 cup Guinness or full lager beer, ½ cup whole milk, 1 tablespoon Dijon mustard, 1 teaspoon Worcestershire sauce, and ¼ cup Buffalo sauce (optional). Whisk continuously until the sauce is smooth and starting to simmer. Reduce heat to low.
Add Cheddar and mozzarella cheeses (reserving ½ cup of the cheddar) and whisk until smooth. Turn off the heat but keep the pan on the burner to stay warm.
Prepare a large baking dish or cast iron skillet with oil or non-stick spray.
Arrange ½ of the waffle fries and any broken pieces on the bottom and drizzle 1/3 of the cheese sauce over top.
Add the remaining fries, cover with the remaining cheese sauce and top with 7-8 slices cooked crispy bacon, crumbled and the previously reserved shredded cheese.
Place the pan in the preheated oven for 3-5 minutes, just so the cheese and fries are warmed through together and the shredded cheese is just starting to toast.
Top with jalapenos, tomatoes, onions and sour cream. (or any additional toppings as desired)
Notes
To ensure crispy fries, that do not get soft too quickly under the cheese sauce, I recommend baking the fries for 5 minutes longer than the package directions.
As with most beer cheese recipes, you will yield the best flavor by using a dark full-flavored lager or Guinness. Do not use a light beer of any kind. It will add no flavor to the cheese and leave it tasting very dull or flat.
Even though we start with a traditional beer cheese recipe, you can easily change it up a bit with different cheeses like Colby jack or pepper jack, as long as the base measurements are followed.
Prefer a little more kick to the dish? Feel free to add additional buffalo sauce to the cheese sauce or add in a pinch or two of red pepper flakes.
The list of topping options is literally endless. Add some additional veggies like chopped bell peppers or try some dry bleu cheese crumbles. Offer a side of Ranch of Bleu Cheese dressing for dipping or extra Sour Cream.
This dish is most often prepared as an appetizer or a side but can easily be turned into the main course. Want more protein? Add some shredded chicken or even pot roast. Want a vegetarian option? Remove the bacon and pile on the veggies like peppers and olives.
Irish Nachos are always best served fresh out of the oven. But if you do have any leftovers, they can be stored in the refrigerator, in an airtight container for up to 2 days. Reheating in the oven or air fryer is recommended to regain some of the crispiness of the potatoes. Preheat the oven to 350 degrees F and bake for 10-15 minutes until completely heated through.