Slow Roasted Chicken Breast Enjoy a delicious sandwich with Oscar Mayer Natural Chicken Breast. Slow roasted to perfection, these deli slices are full of flavor and made from natural ingredients. Delicious and Healthy The all natural chicken breast contains no artificial preservatives, flavors, nitrates, hormones, gluten or colors. Fat free and just 60 calories per serving, these chicken slices are a healthy choice for the whole family. Feel good about eating or serving delicious sandwiches or wraps made with these chicken deli slices for lunch or dinner any day.