How to Make It
Heat oven to 375° F. Butter an 8-inch square baking pan. In a food processor, pulse the flour, sugar, and salt to combine. Add the butter and pulse just until the dough comes together. Transfer to a bowl and gently knead in the oats.
Press all but 1/2 cup of the dough into the prepared pan. Spread the jam evenly over the dough, leaving a 1/4-inch border around the edges. Scatter the raspberries over the jam and sprinkle with the remaining dough.
Bake until the edges are golden, 25 to 28 minutes. Let cool at least 10 minutes before slicing.