A crusty sourdough loaf stuffed with gooey mozzarella and sharp cheddar, brightened by finely chopped jalapeños that add a fresh, lively heat; the tangy starter gives the bread a chewy crumb and complex flavor while the melted cheeses create pockets of savory richness, making each slice perfect for grilled sandwiches, melted over soups, or enjoyed plain for a satisfying balance of spice, creaminess, and rustic sourdough character.