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1
Heat oven to 350 degrees.
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2
Line a 9-inch square baking pan with nonstick foil, foil extending about 2 inches above pan on 2 sides.
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3
Mix flour, baking powder, spice and salt in a small bowl.
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4
Beat butter and sugar in a large bowl with mixer on high speed until smooth.
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5
On medium speed, beat in eggs and vanilla just until combined.
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6
On low speed, beat in flour mixture and milk just to blend.
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7
Scrape batter into prepared pan.
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8
Arrange plums, evenly spaced in diagonal rows, on top.
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9
Scatter with raspberries.
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10
For streusal, rub ingredients together with fingertips until moistened and clumpy.
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11
Scatter between fruit on areas of exposed batter.
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12
Bake 55 minutes or until a wooden pick inserted in center comes out clean and buckle pulls away slightly from sides of pan.
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13
Cool in pan on a wire rack.
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14
Lift foil by ends onto work surface.
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15
Using 2 large spatulas, lift cake from foil onto a serving plate.
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16
Dust with confectioners' sugar.
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17
Serve warm or at room temperature.
