Preheat your oven to 350°F (175°C).

Peel and dice the yellow potatoes into small, even-sized pieces, about 1-inch cubes. Rinse them under cold water and pat dry.

In a mixing bowl, combine the diced potatoes, chopped onion, minced garlic, mayonnaise, 2 cups of cheddar cheese, cooked bacon, onion powder, garlic powder, salt, and pepper. Mix until well-coated.

Transfer the mixture into a greased 9x13-inch baking dish and cover with foil.

Bake covered in the preheated oven for 45 minutes.

Remove foil, sprinkle with remaining cheese, and bake uncovered for an additional 15 minutes until the cheese is melted and bubbly.

Remove from oven and let rest for 5 minutes before garnishing with green onions and serving.