Preheat the oven to 350°F. Grease a large baking dish with butter or cooking spray and set aside.
In a medium-sized mixing bowl, combine flour with rolled oats, brown sugar, granulated sugar, kosher salt, and optional cinnamon. Pour in the melted, unsalted butter and stir well until well coated and crumbly. Place in the fridge to chill while you make the filling.
1 cup all purpose flour, ¾ cup rolled oats , ⅓ cup white sugar, ⅓ cup brown sugar, 1 teaspoon kosher salt, 1 teaspoon cinnamon, ½ cup unsalted butter, melted
Combine the strawberries with sugar in a separate large mixing bowl and mix until the strawberries fully absorb the sugar. Add in vanilla extract,salt, and flour and stir until all of the strawberries are evenly coated.
32 ounces strawberries, hulled and quartered , ¼ cup white sugar, 1 teaspoon vanilla extract, ¼ teaspoon kosher salt, 3 tablespoons all purpose flour
Pour the strawberry mixture into the prepared baking dish. Sprinkle the crumb mixture evenly over the top of the strawberries. Bake in the preheated oven for 35-40 minutes until the fruit is bubbly and the topping is golden brown.
Allow to cool for about 5 minutes before digging in. Serve warm with a scoop of vanilla ice cream, and enjoy!
If you have any leftover strawberry crumble, allow it to cool off at room temperature, then store in an airtight container and store it in the refrigerator for 3-4 days. To freeze, allow it to cool off completely, and place in a freezer-safe container for up to 4 months. Defrost overnight in the fridge and reheat in the oven or gently in the microwave.