Step 1

Preheat oven to 350F. Line an 8×8-inch square pan with aluminum foil and spray with cooking spray (or you can just spray the pan), set aside.

Step 2

In a large microwave-safe bowl add the butter and cook until melted, about 1 minute.

Step 3

Whisk in the sugars and vanilla.

Step 4

Add the flour, oats, optional salt, and stir to combine.

Step 5

Set aside 1 heaping cup of the oatmeal mixture.

Step 6

Press remaining mixture into prepared pan. Evenly spread the raspberry preserves over the crust making sure you cover the entire crust. ( jam should be about 1/8-inch to 1/4-inch thick).

Step 7

Evenly sprinkle with the reserved heaping 1 cup crumble topping mixture. (For bigger chunks, squeeze some of the mixture in your hand).

Step 8

Bake for about 30 minutes or until edges are set and center has just set and is lightly golden browned.

Step 9

Place pan on a wire rack and allow bars to cool for at least 2 hours before slicing and serving.