Jam Crumb Cake

Directions

1. 1.

   Preheat oven to 400°F with rack in middle. Generously butter a 9-inch square or round cake pan.

2. 2.

   Whisk together flour, sugar, baking powder, and salt.

3. 3.

   Whisk together butter, milk, and egg in a large bowl, then whisk in flour mixture until just combined. Pour batter into cake pan. Dollop jam all over surface, then swirl into batter with spoon.

4. 4.

   Whisk together butter, sugars, cinnamon, and salt until smooth. Stir in flour, then blend with your fingertips until incorporated. Sprinkle crumbs in large clumps over top of cake.

5. 5.

   Bake cake until a wooden pick inserted in center comes out clean and sides begin to pull away from pan, about 25 minutes. Cool in pan on a rack 5 minutes.