The River Market’s Breakfast, Lunch, Bar, Bakery, Coffee & Events place! Kansas City’s Best breakfast, lunch, bakery, coffee & events in the City Market. Located in Kansas City’s historic Gillis Opera House, The Opera House Cafe has one of the largest spaces for people to come together to eat, drink and be merry! With a coffee shop & coffee roaster, we have the freshest, handmade coffee drinks in the River Market. Our cafe serves a deliciously diverse menu for breakfast, lunch and brunch!