Instructions Checklist
  • Topping: Preheat oven to 350 degrees. Whisk together flour, brown sugar, and salt in a small bowl. Stir in butter until combined.

  • Cake: Brush a 9-by-9-by-2-inch square cake pan (not nonstick) with butter. Line with parchment, leaving a 2-inch overhang on two sides; butter parchment.

  • Whisk together flour, baking powder, and salt in a medium bowl. In another bowl, beat butter with granulated sugar on medium-high speed until light and fluffy, about 2 minutes. Add eggs, one at a time, beating to combine after each. Reduce speed to low and add flour mixture in 3 batches, alternating with 2 additions of milk, beating until combined and scraping down bowl as necessary.

  • Transfer batter to prepared pan. Spread jam evenly over top. Sprinkle evenly with topping, squeezing to create large clumps. Bake until a tester inserted in center comes out clean, 45 to 50 minutes. Let cool in pan on a wire rack 20 minutes. Use parchment to lift cake out of pan, then let cool completely on rack before serving.