Cream shortening, sugar and eggs. Mix together flour, baking powder, baking soda and salt. Add to creamed mixture alternately with sour cream.
Grease and flour a regular-sized tube pan**. Spread half the batter in the pan, and sprinkle with half the topping mixture. Repeat with remaining batter and topping.
Bake in a preheated 350°F oven for 25 to 30 minutes, or until cake tests done. Cool 10 to 15 minutes, and remove cake from pan. Place cake right-side-up (topping up) on a plate to serve.
*I usually use a butter-flavored shortening, or margarine.
**I make this in a 9 x13-inch pan if it's for family, and just serve it right from the pan in squares.
This coffeecake is also delicious made with plain or vanilla yogurt, or buttermilk. If you bake it early in the morning, you can carry it outside for an al fresco breakfast before work!
If you make this in a 9 x 13-inch pan -- a handy, stable size for transporting to picnics or potlucks -- be aware that you'll have to spread the batter quite thinly to cover the bottom of the pan. Spoon half into the pan, using a rubber spatula to spread