Preheat the oven to 350 degrees. Butter a 4 6-inch cast iron skillets (or a 9x9 baking pan or 10-inch cast iron skillet). Set aside.
In the bowl of a standing mixer (or using a hand held mixer), cream the ¼ cup softened butter until fully soft. Add the shortening and mix to fully combine.
Add the ½ cup sugar to the butter mixture and beat to combine.
Add the egg to the mixture and beat to fully combine.
In a separate mixing bowl combine the 1 ¼ cups flour, baking powder, salt; mix together thoroughly. Slowly pour into the butter mixture while running the mixer on a low speed. The mixture may be a bit dry.
While the mixer is still running slowly pour in buttermilk and beat until fully combined.
To make the Streusel: Cut the cold ¼ cup butter into small pieces. Combine ¼ cup sugar, 1/3 cup flour, and the nutmeg and ginger in the bowl. Using dinner knives or a pastry blender, cut the ingredients together forming a pebble-like mixture.
Spoon theevenly batter into the prepared skillets or baking pan. Evenly layer the chopped strawberries on top of the batter in each skillet. Distribute the streusel evenly across the top of each skillet mixture.
Bake in the oven for 25-30 minutes (or 40-45 minutes if using one pan or larger skiller) until the top is a light golden brown. Allow to sit for five minutes before serving warm!