Step 1

Cream together butter, oil, and sugar. Then add eggs and vanilla.

Step 2

Add the sour milk and beat well. Sift in the flour and the zucchini. Mix until incorporated.

Step 3

Add the rest of the ingredients. Mix well.

Step 4

Pour the batter in a greased 9 x 13 pan, bake for 50 minutes. Sprinkle with chocolate chips when still hot out of the oven.

Step 5

This cake is best served warm, but it's good anytime.