Preheat the oven to 350℉. Line a 8x8 square baking pan with parchment paper, leaving an overhang for easy removal.
Crumble Topping : In a large mixing bowl, combine the oats, flour, light brown sugar, ground ginger, and kosher salt. Once mixed, add the melted butter and mix until well combined and crumbly. Making sure to break up extra-large crumbles into smaller crumbles.
1 cup old-fashioned oats, 3/4 cup all-purpose flour, 1/2 cup packed light brown sugar, ¼ teaspoon ground ginger, ¼ teaspoon kosher salt, 1/2 cup (1 stick) butter
Reserve 1 cup of the oat mixture for the topping and set it aside. Firmly press the remaining oat mixture into an even layer into the bottom of the prepared pan.
In a separate large bowl, mix together the strawberry pie filling, cornstarch, lemon juice, and 1 tablespoon granulated sugar until thoroughly combined. Spread the strawberry mixture evenly over the crust in the baking pan.
1 can (21 oz) strawberry pie filling, 1 tablespoon cornstarch, 1 tablespoon freshly squeezed lemon juice, 2 tablespoons granulated sugar
Sprinkle the reserved oat mixture evenly over the strawberry layer, then sprinkle the remaining 1 tablespoon of granulated sugar over top.
Bake for 40-50 minutes or until the top is golden brown and the filling is bubbly. Allow the bars to cool completely inside the pan on a wire rack.
Make The Vanilla Glaze : Whisk together the powdered sugar, milk, and vanilla extract until your desired consistency is reached - for a thicker glaze use less milk, and for a thinner glaze add more milk. Drizzle the glaze over top of the cooled bars. Once the glaze has set, lift the bars from the pan using the parchment paper overhang and cut into 9 squares. 1 cup powdered sugar, 1-2 tablespoons milk, ½ teaspoon vanilla extract