Preheat oven to 375 degrees. Spray a 9×9 pan with cooking spray.
Pour flour, sugar and salt into a food processor and combine by pressing the pulse button a few times.
Cut butter into cubes and add to the food processor.
Press the pulse button until the butter has been incorporated into the crumb mixture. Add the oats and press to combine again. Remove ½ cup of the mixture and set aside to use for the topping.
Add 1 tablespoon of orange juice to the food processor and to combine, press pulse a few times.
Pour the mixture from the food processor into the greased 9×9 pan. Press it into the pan evenly.
To make the filling, combine the brown sugar, flour and orange juice until moistened and then add the sliced strawberries. Mix until the strawberries are coated.
Distribute the strawberries evenly onto the crust.
Sprinkle crumb topping over the strawberries.
Before you put this in the oven, spray the top with cooking spray. Bake at 375 degrees for 40-45 minutes.