Quick & easy boston cream pie

    
1eacake mix, yellow, single layer size
1eaegg
1xwater
1/2tslemon extract
1eavanilla pudding, package
1 1/2cmilk
1tsvanilla
1eachocolate frosting, can
Directions:
Prepare the cake mix using the egg, water, and lemon extract, following label directions.  Pour into a greased and floured 8 inch round cake pan. (9 inch is too large and causes cake to be too flat.)Bake at 350 degrees for time indicated on the cake package, or until the center of the cake springs back when lightly touched.  Cool cake in pan on rack for 10 minutes.  Remove from pan and cool completely.  Prepare pudding mix with milk and vanilla and cook according to package directions.  Cover with plastic wrap to prevent skin from forming on top and cool completely.  Split layer cake, fill with cooled vanilla pudding, put cake back together and then frost with enough chocolate frosting to cover the top.  Store in refrigerator.