Preheat oven to 350 degrees F and grease a 9x13 baking sheet with nonstick cooking spray. Break apart cookie dough and press evenly into pan. Bake for 16-20 minutes or until golden brown. Let cool completely.
Add food coloring to frosting and mix well to color green. Set aside.
Before cutting cookie bars, set a peep or two onto the cookies in the pan. Use a knife to cut the bars, the peep bars will be a little bigger than the nest bars. You should end up with about 15 bars.
Frost each bar with green frosting.
To create the nest, take 3 strands of edible grass and roll it into a small circle, about the size of a dollar coin. As you release the grass, it should open up a bit to be about the size of the cookie. Place on top.
Place a peep on top of the grass with two eggs next to it. To make the nest cookies, place three to four eggs into the center of the nest.