Orange Butter Cream Squares

This recipe was yummy. I made it for the baby shower for Jessika but threw it out because the presentation was awful. I'm not sure what I did wrong.
First, I ended up adding more oreo crumbs so that I would have enough for the bottom of the pan.
And then the filling didn't nearly cover the top like it should have.

I will try it again but will make double the amount of filling.

Yummy orange buttercream bars.

Use real butter for this recipe.

Servings: 25

Ingredients:

Crust:
1 1/4 c. Oreo cookie crumbs, plus an extra handful of crumbs
1/3 c. butter, melted

Filling:
1 1/2 c. powdered sugar
1/3 c. butter, softened
2 tsp. grated orange peel
1 tbsp. milk
1/2 tsp. vanilla

Directions:

In a medium bowl, stir together 1 1/4 cup cookie crumbs and 1/3 cup melted butter. Press on bottom of a 9 inch square pan. Cover, refrigerate until firm, about 1 hour.

To make filling, in a small mixer bowl, combine powdered sugar, 1/3 cup butter, orange peel, milk and vanilla. Beat at medium speed, scraping bowl often, until creamy, 3 to 4 minutes. Spread over crust.

Lightly sprinkle additional cookie crumbs on top. Refrigerate until firm, 1 to 2 hours. Cut into bars, store refrigerated.