Ingredients

• 3 tablespoons butter
• 1 small jalapeno pepper, diced
• 2 garlic cloves, minced
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper, fine grind
• 1 1/2 cups heavy cream
• 1 cup half-and-half cream
• 2 cups cheddar cheese, grated
• 2 cups monterey jack cheese, grated
• 5 lbs russet potatoes, peeled and sliced into thin rounds (about 1/16-inch thick)
• 1/2 cup leek, diced (1/2-inch pieces, bottom white part only)