Cinnamon chocolate chip cake

I've had this recipe from my mom for many years. It's slowly becoming part of my Shabbat cake rotation... especially when I ask the boys what I should make for Shabbat, and one of them requests it.

I usually double the recipe and bake it in a tube pan. When I try to make a double recipe in a rectangular pan, it tends to be underdone in the center.

Now on to the recipe (ingredients have NOT been doubled here)...

2 eggs
1/2 cup milk (I used soy milk)
3/4 cup margarine
2 teaspoons baking powder
3/4 cup sugar
1 1/2 cup flour
1/2 teaspoon salt

Topping:
1 tablespoon cinnamon
1/4 cup flour
1/2 cup sugar
1/2 - 3/4 cup chocolate chips
2 tablespoons melted margarine

Mix together the batter ingredients.
In a separate bowl, mix topping ingredients.
Pour 1/2 of the batter into a greased 8x8 pan. Top with 3/4 of the chocolate chip crumble. Cover with the rest of the batter and finally, the rest of the chocolate chip crumble.
Bake 350 degrees F for 45 minutes.

So what favorite recipe from mom or grandma is a regular in your own repertoire?