Whoopie pies -- creamy filling sandwiched between two soft cakelike cookies -- are a New England tradition whose popularity is spreading for an obvious reason: They're delicious! Try pairing these sweet, flavorful cookies with a tall glass of milk.

Cuckoo for cocoa? Get your fix with these bite-size delights. See our how-to video for the secret to Fillling a Pastry Bag -- simply just leave off the pastry tip for a quick and easy way to add the filling to your whoopie pies.

Cream cheese gives this pumpkin filling its velvety texture, while pumpkin puree adds color and flavor. Watch Martha and Cookie Monster make these irresistible treats together!

These banana cookies stuffed with cream-cheese frosting unite two favorites -- whoopie pie and moist banana cake.

These whoopie pies are best eaten the day they're made, which shouldn't be a problem since chocolate and peanut butter is such an irresistible combination. 

Take the graham-cracker crust and bright, tart filling of a traditional key lime pie and reinvent it in a cookie.

A dusting of powdered sugar makes these pink-piped whoopie pies extra pretty. 

This traditional New England interpretation of whoopie pies comes courtesy of Cranberry Island Kitchens in Maine. 

Creme de Cassis, a black-currant liqueur, gives the filling its beautiful purple color and sweet, fruity flavor. 

Spiced pumpkin cakes keep this chocolaty filling from tasting overly sweet. 

Take a tip from Martha and use a 1-ounce ice cream scoop to form the cookies.