Give Me S'Mores cake

I made this awesome cake for Trent's 1st birthday. It definitely took more work than a box cake BUT, wasn't that hard. And, it really tastes like a S'Mores! Cake:
1/2 cup shortening
1/4 cup butter, softened
1 cup sugar
3 eggs
1 tsp. vanilla extract
2-3/4 cups graham cracker crumbs
3 tsp. baking powder
1 can (12 oz) evaporated milk

Marshmellow Frosting:
4 egg whites
1 cup sugar
1/2 tsp. cream of tartar
1-1/2 tsp vanilla extract
1-1/2 cups miniature semisweet choc. chips, divided

Line two 9-inch round baking pans with waxed paper and grease the paper; set aside. In a large bowl, cream the shortening, butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in vanilla. Combine cracker crumbs and baking powder; add to the creamed mixture alternately with milk, beating well after each addition.

Transfer to prepared pans. Bake at 350 degrees for 18-22 minutes or, until a toothpick inserted in the middle comes out clean. Cool for 10 minutes before removing from pans to wire racks to cool (note: I let mine cool longer.. until the cake came away from the wax paper easily)

In a large saucepan, combine the egg whites, sugar and cream of tartar over low heat. With a hand mixer, beat on low speed for 1 minute. Continue beating on low over low heat until frosting reaches 160 degrees, about 8-10 minutes. Pour into a large bowl; add vanilla. Beat on high until stiff form peaks, about 7 minutes.

Place a cake layer on a serving plate; spread with 2/3 cup frosting and sprinkle with half of chips. Top with remaining cake layer. Frost top and sides of cake; sprinkle with remaining chips.