Bake the cake as directed. Allow it to cool completely.
Frost the cake.
Keeping the Peeps attached to each other, arrange them around the edge of the cake.
Arrange the chocolate chips in the center to look like sunflower seeds. (I went all out and had three different sizes of chocolate chips, staring with the largest around the outside and progressing inward to the smallest).
Note: Gluten-free cake mixes usually make one 8- or 9-inch round cake. Normal cake mixes make two. The original recipe (http://www.tasteofhome.com/Recipes/Peeps-Sunflower-Cake) says to make two round cakes and use two jars of frosting to layer the cakes/frost the outside.