Cheesy Garlic and Chive Potatoes

*from Our Best Bites: Savoring the Seasons cookbook*

Single Recipe for 8x8" pan:
2 pounds baking potatoes (russets)
1 1/2 cups sour cream
1/4 cup freshly chopped chives OR 2 TBSP dried chives
3 cloves garlic, minced
2 TBSP grated onion
1 1/2 tsp kosher salt
1/4 tsp black pepper
1 1/4 cup sharp cheddar cheese, divided
1 1/4 cup grated swiss or Gruyere cheese, divided

Doubled for 9x13" pan:
4 pounds baking potatoes
3 cups sour cream
1/2 cup freshly chopped chives OR 1/4 cup dried chives
6 cloves garlic, minced (1 TBSP)
1/4 cup grated onion
1 TBSP kosher salt
1/2 tsp black pepper
2 1/2 cups sharp cheddar cheese, divided
2 1/2 cups grated swiss or Gruyere cheese, divided

1) Cook potatoes a day ahead. Preheat oven to 425 degrees. Wash potatoes, with skins on, under cold water. Pat dry, Pierce each potato a few times with a knife and then place directly on the oven rack. Bake about 1 hour or until you can easily pierce the potatoes with a knife all the way through. Remove from oven and cool completely. Cover potatoes with plastic wrap, and refrigerate until ready to use.

2) NEXT DAY: Preheat oven to 350 degrees. Using a large hole box grater, grate potatoes with skins on. Some of  the skin will naturally peel off and you can discard it. Combine sour cream, chives, garlic, onion, salt, and pepper in a large mixing bowl. Add grated potatoes and gently toss to combine. Add 1 cup of Cheddar Cheese (or 2 cups, if doubling), and 1 cup of Swiss/Gruyere cheese (or 2 cups, if doubling) and fold in to combine.

3) Spray 8x8 (or 9x13) pan, and place mixture in the greased pan. Sprinkle leftover cheeses on top. Bake 30-40 minutes, until hot and bubbly and lightly browned around the edges. Cool for 10 minutes before serving.