Muffins are good for 1 year if they are kept frozen. Your email address will not be published. Try these, and other Otis Spunkmeyer baked goods here! Thank You so much. From cookies and cakes to mini muffins, you're sure to find a sweet treat with none of the funky stuff! These muffins are part of Otis Spunkmeyer’s flagship line of muffins and cookies. At Otis Spunkmeyer, we’ve been dedicated to baking, experimenting, and creating delicious baked goods for over 40 years. Whether it’s a question, suggestion or just a hello, we are always excited to hear from our customers.