Nectarine Cake Squares

Directions

1. 1
   Preheat oven to 350F.
2. 2
   Butter and flour a 13- by 9- by 2-inch metal baking pan, knocking out excess flour.
3. 3
   Sift together flour, baking powder, baking soda, and salt into a small bowl.
4. 4
   Beat together butter and 1 cup granulated sugar in a large bowl with an electric mixer at medium-high speed until pale and fluffy, about 2 minutes, then beat in vanilla and almond extract.
5. 5
   Add eggs 1 at a time, mixing at low speed after each addition until just combined.
6. 6
   Add flour mixture and sour cream alternately in 3 batches, mixing after each addition until just combined.
7. 7
   Spread batter in pan, smoothing top.
8. 8
   Cut nectarines lengthwise into 1/8-inch slices and toss with lemon juice and remaining 3 tablespoons granulated sugar in a bowl.
9. 9
   Arrange slices, overlapping slightly, in 4 crosswise rows over batter.
10. 10
    Cover surface of cake with a piece of buttered wax paper (paper helps fruit glaze itself) and bake in middle of oven 15 minutes.
11. 11
    Remove paper and bake until a tester comes out clean, 20 to 25 minutes more.
12. 12
    While cake is still warm, dust generously with confectioners sugar, then cool completely on a rack.