Boil potatoes for 20-25 minutes until soft, then drain and break them up to desired consistency.
Add butter, salt, ground black pepper, onion powder, garlic and herb seasoning, and mix well.
Incorporate heavy cream gradually for desired creaminess, then add sour cream and mayonnaise.
Adjust seasoning with garlic powder, Italian seasoning, and additional garlic and herb seasoning.
Mix in white sharp cheddar cheese, Mexican cheese blend, and crispy bacon.
Transfer mixture to a buttered 9x13 casserole dish, smooth it out, and top with remaining cheese and bacon.
Add chives, green onions, or jalapenos if desired.
Preheat oven to 375°F, bake uncovered for 25-30 minutes until cheese is melted.
Serve and enjoy the creamy, flavorful loaded baked potato casserole.
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