"For a crowd-pleasing dessert, look no further than these jam crumb bars..."
INGREDIENTS
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1 1/2 cups (3 sticks; 12 ounces) unsalted butter, divided
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2 cups all-purpose flour, divided
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1 cup sugar, divided
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1 cup rolled oats, divided
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2 cups jam (flavor of choice; I usually like to use raspberry or a berry fruit spread)