Preheat the oven to 350F.
lace the strawberries in a bowl and add the lemon juice and sugar. Set aside.
For the topping: Combine the flour, sugar, brown sugar, oatmeal and butter in a bowl. Mix well until well combined.
Pour the strawberry mixture in the baking dish. Sprinkle the topping evenly over the fruit.
Bake until the topping is crisp and golden brown and the strawberry filling bubbles slowly, about 40 minutes. Serve warm.