Step 1

Preheat the oven to 350°F (175°C). Grease a 9x13-inch baking pan and line with parchment paper. Set aside

Step 2

Make the crust: In a large bowl, mix the flour, powdered sugar, salt, and baking powder until well blended. Cut in the butter with a knife or pastry cutter until the mixture resembles coarse crumbs, then stir in the eggs. Alternatively, place everything in a food processor and pulse until just combined.

Step 3

Stir in the oats then remove 1/3 for the crumb topping. Press the remaining crust mixture evenly into the prepared baking pan and bake for 10-12 minutes. Remove from the oven and set aside.

Step 4

Make the filling: In a saucepan, combine half of the sliced strawberries, granulated sugar, cornstarch, and lemon juice. Cook over medium heat, stirring frequently, until thick, about 10 minutes. Stir in the rest of the fruit, remove from the heat, and let cool slightly.

Step 5

Spread the strawberry filling evenly over the pre-baked crust, sprinkle the crumb topping evenly over the strawberry filling, then bake again for 30-35 minutes, until lightly browned on top.

Step 6

Let the bars cool completely in the baking pan. Then, lift them out gently, slice, serve, and enjoy!