baked goods comprising a base portion and a filling or upper portion are prepared by applying the filling or upper portion dough to the base portion so that the filling or dough penetrates grooves in the dough of the base portion . the filling or upper portion is baked in place to cause the two portions to adhere and bond together . in an embodiment , a pet egg treat has the general shape of a longitudinal or transverse slice of hard - boiled egg . the yolk portion contains real egg yolk solids , while the outer egg - shaped portion contains flour , egg solids and any type of nutritious meal , including meat meal , fish meal , oat meal , or the like . flavorings , as well as vitamins , coloring agents , and minerals can be included . the treat is hard and helps to clean pets &# 39 ; teeth and gums , and provides chewing exercise for pets . the treat preferably has a round - or oval - shaped base portion having a light coloring to simulate the egg white portion of a hard - boiled egg , with the filling simulating the color and shape of the yolk , so that the product has the appearance of a slice of a hard - boiled egg .