Sour Cream Coffee Cake

2 c. sugar
1 c. or 225 grams butter
2 eggs
1 c. sour cream/sour milk
1 tsp. vanilla
2 c. flour
1 1/2 tsp. baking powder
1/4 tsp. salt

Preheat oven to 180*.  Cream sugar & butter until fluffy; add eggs, one at a time, then rest of ingredients.  Grease & flour bundt pan; put in half of batter; sprinkle on sugar & cinnamon (and nuts and/or apples).  Pour rest of batter in, sprinkle sugar & cinnamon on top.  Bake until toothpick comes out mostly clean; about 35 mins.