Preheat oven to 350°. Prepare two 9x9 pans by lining them with parchment paper like a sling. Use binder clips to hold in place if necessary. Spray sides and bottom with baking spray and set aside. (For 9x13 instructions, see notes.)
baking spray
In a food processor, layer in the crust ingredients in the order listed. Gently pulse the ingredients together until they look like large crumbs and everything is evenly mixed (see photo in post). Pour crust mixture evenly into the pans. Use your fingers, a flat bottomed measuring cup, or a tart tamper to press crust in evenly.
2 cups flour, ½ cup sugar, 1 teaspoon vanilla, ½ teaspoon salt, 1 cup butter
Spread jam evenly over crust.
24 ounces raspberry jam
In food processor gently pulse topping ingredients. You are looking for relatively uniform crumb pieces with no dry spots remaining. Sprinkle evenly over jam layer.
1 cup rolled oats, 1 cup brown sugar, 1 cup flour, ½ teaspoon cinnamon, ½ cup butter
Bake on center rack of oven for 45 minutes. The top should be lightly golden brown. Cool completely before cutting.