Fried Potato Blintzes

Ingredients

• 2 tablespoons butter
• 2 large yellow onions, finely diced
• 4 russet potatoes, peeled and cut into ½-inch cubes
• 3 cloves of garlic, peeled and crushed
• 2 teaspoons kosher salt
• ½ teaspoon black pepper
• 2 cups all purpose flour
• 2 cups whole milk
• ½ cup seltzer water
• 4 eggs
• 2 tablespoons butter, melted, divided, plus more as needed
• Non-stick cooking spray
• Vegetable oil, for frying
• Sour cream and thinly sliced chives, for serving