Basic Cinnamon Swirl Coffee Cake

After meaning to make some coffee cake for months I finally got a recipe and had at it.  This is based on the one online from King Arthur Flour's website, and is pretty good for a basic coffee cake recipe.  Though I am hoping to get some inspiration from you folks in terms of ways to jazz it up!  Something with fruit or jam?  If you have a recipe, please share it!

Basic Cinnamon Swirl Coffee Cake

This coffee cake is broken down into three components, the cake, the topping, and the filling.

Cake Ingredients:
3/4 C margarine, softened
1 t salt
1 1/2 C sugar
1/3 C brown sugar
2 1/2 t baking powder
2 t vanilla
3 eggs
3/4 C yogurt
1 1/2 C milk
3 3/4 C flour

In a large bowl, cream the margarine and the sugars
Add vanilla and eggs
Add yogurt
Add baking powder and salt
Add the milk and flour alternating
(1 cup flour, 1/2 C milk...)

Topping Ingredients:
2/3 C sugar
pinch salt
3/4 C flour
1/2 T cinnamon
4 T softened margarine

In a small bowl, add margarine
With a large fork add remaining ingredients and press together
(Or using your hands, rub the ingredients together)
Until they resemble coarse crumbs or wet sand
Be careful not to over-mix, or you will end up with hunks that are more work to break apart

Filling Ingredients:
1 C brown sugar
1 1/2 T cinnamon

In a small bowl, combine with a fork until evenly dispersed

Grease a 9 x 13 baking pan (flat cake pan)
Spread one half of the cake mixture over the bottom of the pan, using a butter knife or rubber scrapper to smooth it out
Sprinkle the filling evenly over this
Drizzle the remaining half of the cake over top and gently shake the pan to level it out
Using your fingers, sprinkle the topping on top as evenly as you can, and gently press into the cake batter

Bake at 350 55-60 minutes, mine was done at 56 mins on the center rack.
Topping should have a golden brown color.

Enjoy!  But don't forget to let it cool for a few minutes before you dive in :)