preheat oven to 350F
in a mixing bowl, combine 1 cup melted butter + 1 cup dark brown sugar + 1 1/2 cup oats + 1 1/2 cup all purpose flour + 1 tsp baking powder
press down 2/3 of it into a lined/oiled 8×8 dish
mash 2 cups strawberries and evenly spread over the base of the bars
sprinkle remaining crumble on top
bake for 45-50 min or until top is golden and strawberries are bubbling
allow to cool before cutting into bars