Homemade Au Gratin Potatoes

1 Preheat oven to 400°F.
2 Boil potatoes in salted water for 5–8 minutes. Drain and set aside.
3 In a saucepan, melt butter over medium heat. Whisk in flour to form a roux.
4 Add diced onion and garlic. Cook until fragrant.
5 Stir in evaporated milk and heavy cream. Simmer on low until thickened. Season to taste.
6 Mix in half of the shredded cheese. Stir until smooth.
7 In a greased cast iron or baking dish, layer as follows:
8 Potatoes → light seasoning → cheese sauce → bacon bits
9 Repeat, then top with remaining shredded cheese
10 Bake uncovered for 45 minutes or until golden and bubbly.
11 Garnish with chives or more bacon. Serve hot and enjoy!