Tostadas are a favorite food in Guatemala, best enjoyed in a large group of friends and family. Easy to assemble and endlessly personalizable, these tostadas lend themselves perfectly to entertaining. Usually fried, this recipe keeps the tortillas on the lighter side with a simple brush of heart healthy olive oil before toasting in the oven. The easy swap from refried beans to mashes black beans also lightens this recipe significantly, without sacrificing on flavor. The addition of sweet potatoes gives these tostadas a boost of fiber and vitamin A, which bolsters you eyes, skin, and immune system health. Set out all the fixings for these and let everyone make up their tostadas just the way they like them.