Frittata without cheddar cayenne

12 ounces applewood-smoked bacon, cut into 1/2- to 3/4-inch pieces 1 cup sliced shallots 12 cups (packed; 12 ounces) assorted coarsely chopped greens (such as[...]

add to shopping list Nonstick vegetable oil spray 1 12-ounce bunch Swiss chard, stems and center ribs removed 1 tablespoon olive oil 1 cup chopped onion 8[...]

add to shopping list 1 1/2 tablespoons olive oil 6 ounces pancetta* or bacon, cut into 1/4-inch pieces (about 1 1/2 cups) 1 1/2 cups chopped red onion 12[...]