In a large mixing bowl, add in the butter and shortening. Mix on medium until combined.
Add in the brown and granulated sugars. Mix on medium until light and fluffy. This will take about 2-3 minutes.
Add the egg and vanilla and continue to mix on medium until incorporated.
Add in the cake flour, malted milk powder, cornstarch, and bakind soda. Mix on low until everything is incorporated.
Using a small cookie scoop, scoop cookies onto an ungreased cookie sheet. Leave about 2 inches for the cookies to spread.
Place in the oven to bake for about 6-7 minutes. If you make larger cookies, bake for about 10 minutes until the edges are lightly browned.
Immediately place a malted milk egg in the center of each cookie and let cool.
Once the cookies are completely cooled, place the green frosting in a piping bag with the grass tip. I used a premade green frosting and the tip number is 233. Pipe grass around the eggs and add some egg shaped sprinkles!