Preheat your oven to 325°F (163°C) and get a 9×13 baking pan ready by greasing it lightly.

In the prepared baking pan, mix together the diced potatoes, shredded cheddar cheese, cooked and crumbled bacon, minced garlic, and chopped onion.

Add the mayonnaise to the potato mixture and stir until everything is evenly coated.

Place the pan in your preheated oven and bake for about 1 1/2 hours, or until the potatoes are tender and the top is golden brown.

Serve hot straight from the oven and enjoy the creamy, cheesy, bacon-filled delight that is Mississippi Mud Potatoes!