½Cup(s)buttermilk to make buttermilkuse a scant 1/2 cup of milk and pour in a drop of white vinegar. Let sit for 2 minutes.
½tspvanilla extract
For the Crumb Topping:
¼Cup(s)flour
¼Cup(s)brown sugar
2tbspbutter
Instructions
Filling: In a small saucepan, add the water and strawberries. Bring to a boil, then simmer, covered, 5 minutes. Add in the cornstarch and sugar. Stir 2 minutes over medium heat until thickened. Remove from heat.
Cake: In a medium or large bowl, combine flour, sugar, baking powder, and baking soda. Cut in the 1/4 cup butter with a fork until you have loose crumbs. Make a well in the middle and set aside. In a small bowl, mix together the egg, buttermilk, and vanilla. Pour the egg mixture into the flour mixture. Mix until just combined. Do NOT overmix. Spread 3/4 of this batter in an 8x8 glass or foil baking pan. Cover with all the fruit mixture. Add the other 1/4 batter in dollops on the top.
Crumb Topping: In a small bowl, add 1/4 cup flour to 1/4 cup brown sugar. Cut in the 2 tbsp butter until you have large crumbs, then pour over the whole cake. Bake at 350 for 40-45 minutes.