Preheat oven to 400 degrees F (205 degrees C). Butter a 9x13 baking dish.
Combine sugar, cornstarch, and water. Cook over medium heat, stirring constantly, until thick and hot. Stir in strawberries, and remove from heat. Pour mixture into the baking dish, and dot with 2 tablespoons butter.
Sift together the flour, sugar, baking powder, and salt. Blend in 3 tablespoons butter. Stir in cream. Mixture should be fairly soft. Spoon on top of berries.