Raspberry Oatmeal Crumble Bars
- 1/2 cup (1 stick) unsalted butter, melted
- 1/2 cup granulated sugar
- 1/4 cup light brown sugar, packed
- 1 teaspoon vanilla extract
- 1 cup all-purpose flour
- 3/4 cup old-fashioned whole-rolled oats (don’t use quick cook or instant, they’re finer and behave like flour and will make mixture too dry)
- pinch salt, optional and to taste
- about 12 ounces raspberry preserves (I used about two-thirds of one 18-ounce jar with seeds, use seedless preserves if preferred)
- Preheat oven to 350F. Line an 8-inch square pan with aluminum foil and spray with cooking spray; set aside.
- To a large, microwave-safe bowl add the butter and heat on high power to melt, about 1 minute.
- Add the sugars, vanilla, and whisk to combine.
- Add the flour, oats, optional salt, and stir to combine. Mixture will have some larger, well-formed crumble pieces as well as some sandier, dryer bits.
- Set 1 heaping cup mixture aside to be sprinkled on later as crumble topping.
- Transfer remaining mixture to prepared pan, and using a spatula or your fingers, hard-pack the mixture to create an even, smooth, flat crust.
- Evenly spread the raspberry preserves over the crust making sure there’s complete coverage. Preserves should be about 1/8-inch to 1/4-inch thick.
- Evenly sprinkle with the reserved heaping 1 cup crumble topping mixture. Before sprinkling, I squeeze the mixture in my palm to encourage bigger crumble pieces to form.
- Bake for about 30 to 32 minutes, or until edges are set and center has just set and is lightly golden browned. Place pan on a wire rack and allow bars to cool for at least 2 hours before slicing and serving. Bars will keep airtight at room temperature for up to 1 week or in the freezer for up to 6 months.