Preheat your oven to 325°F (165°C). Gather your baking essentials and a 9x13 inch baking dish.

Peel and dice about 4-5 medium-sized potatoes into small cubes. Keep them in cold water.

In a frying pan over medium heat, cook strips of bacon until crispy, about 8-10 minutes. Crumble once cooled.

In a large mixing bowl, combine the diced potatoes, crumbled bacon, Cheddar cheese, minced garlic, chopped onion, and mayonnaise. Mix well.

Grease your baking dish and pour the potato mixture into it, spreading evenly.

Bake for 1½ hours. Check for doneness after the first hour.

Once done, let the casserole sit for a few minutes before serving. Consider adding sour cream or chopped chives as toppings.