Preheat oven to 375 degrees. Spray a 13x9 in pan with non stick spray.
In electric mixer stir together flour, sugar and salt.
2 1/3 cups all-purpose flour, 2/3 cup granulated sugar, 1/2 teaspoon salt
With the mixer on a low speed add the 1 cup of butter, 1 piece at a time. Continue mixing until combined, it takes about 1 to 1 1/2 minutes. It will be the consistency of damp sand. Set aside 1 1/4 cup of this mixture to use in step 4. .
1 cup Butter - cut into 1/2 inch pieces
Press the remaining flour mixture firmly into the bottom of the pan. Bake at 375º F for 14 minutes. The edges will be slightly browned.
Meanwhile, combine brown sugar, oats, and the reserved flour mixture. With your fingers, work in the remaining 2 Tablespoons of butter, until it is in small clumps.
1/4 cup light brown sugar, 1/2 cup Quick Cooking Oats, + 2 Tbls butter
Combine the jelly, chopped strawberries and the lemon juice in a small bowl. Mash with a fork to combine. Be sure to leave some chunks of berries in there.
1 cup strawberry jelly or jam, 1 1/2 cup fresh strawberries, 1 teaspoon lemon juice
Spread filling evenly over the hot crust. Sprinkle with the streusel topping over the strawberries.
Bake for 22 to 25 minutes. The crust will be brown, and the filling will be bubbly.
Remove from the oven and cool completely before slicing.