Cake:
2 cups flour, sifted
1 teas. bak­ing pow­der
1 teas. bak­ing soda
1/2 teas. salt
1 1/4 cups sugar
1/2 cup oil
1/2 cup plus 2 tbsp. yogurt (equal to 1– 6 oz. con­tainer)
2 teas. vanilla
1 1/2 cups milk

Cream Fill­ing:
1/3 cup sugar
2 tbsp. plus 1 teas. corn­starch
1/8 teas. salt
1 1/2 cups milk
1 teas. mar­garine
1 teas. vanilla

Ganache:
1/4 cup mar­garine
1/2 cup choco­late chips
3 tbsp. milk, room temperature