Preheat oven to three hundred and fifty degrees
Cream the one-half cup of shortening, one-third cup of butter, and one cup of softened butter together in a bowl. Add the two eggs, one at a time until well mixed.
In a separate bowl, blend the two and one-quarter cups of Bisquick, two teaspoons of baking powder, and one-half teaspoon of salt.
Stir the creamed ingredients into the dry, add the buttermilk, and mix well.
Place batter into a greased cake pan and bake for approximately fifty minutes, or until the sides pull away from the pan.
Mix the one-quarter cup of sugar with one teaspoon of ground cinnamon, and sprinkle over the top of the cake.
Add the sliced strawberries and serve with whipped cream.