Blackberry Crumble Jam Bars with Oat Streusel

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These Blackberry Crumble Jam Bars are my favorite summer dessert. Like, the taste of the season, in every bite. Soft, buttery, and oh-so-yummy!



3 cups old fashioned oats
3 cups all-purpose flour
11/2 cup packed brown sugar
1 teaspoon baking powder
12 tablespoons butter, melted (1-1/2 cups)
1/2 teaspoon salt
13 ounce jar blackberry jam (heaping cup)


Preheat the oven to 350 degrees and line a 9×13 inch baking pan with parchment paper. Set aside.

Making the Crust: Mix the oats, flour, brown sugar, baking powder, melted butter, and salt together until a crumble-like mixture emerges. Press two thirds of the crumble into the bottom of the prepared baking pan. Bake for 10 minutes.

Baking the Jam Bars: Remove the crust from the oven and spread the jam over the top. If necessary, warm the jam in the microwave until it is spreadable. Sprinkle the remaining 1/3 streusel over the top of the jam layer; bake for another 25-30 minutes.

Cooling: Remove the bars from the oven and cool completely before cutting. Because I can be a tad impatient — and my guys will devour them too soon, I like to refrigerate the bars until they become solid enough to cut. But… if you’re like me and can’t wait, sometimes, they’re kind of good warm too. Add some melty vanilla ice cream for an extra special treat. Otherwise, cut into 9 to 16 bars when cool and firm.

Keywords: Blackberry Crumble Jam Bars with Oat Streusel, Blackberry Crumble Bars, Jam Bars

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