4 large russet potatoes, peeled and thinly sliced
1 medium onion, finely chopped
2 cloves garlic, minced
1 cup heavy cream
1 cup milk
1 cup shredded cheddar cheese
1/2 cup grated Parmesan cheese
2 chipotle peppers in adobo sauce, minced
2 tablespoons butter
2 tablespoons all-purpose flour
1 teaspoon salt
1/2 teaspoon black pepper
1/2 teaspoon smoked paprika