Use your favorite sugar cookie recipe (or even a store bought mix) and add green food coloring gel to the cookie dough while mixing.
For the frosting:
4 cups powdered sugar
1 cube softened butter (not melted)
1/2 tsp. almond flavoring
1 tsp. vanilla
desired amount food coloring (I used pink gel coloring, red would be cute too!)
Add a few tablespoons of milk at a time until it is the right consistency. There is no exact recipe, but this makes a fairly large amount of icing.
Top with mini chocolate chips for the seeds, or chocolate sprinkles.