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1
Set oven to 350 degrees.
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2
Set oven rack to second-lowest position.
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3
Grease a 13 x 9-inch baking pan.
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4
To make the cheesecake topping: in a food processor, blend all ingredients for 1 minute until smooth; remove to a bowl.
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5
In the processor without cleaning the bowl, add in 1/2 cup butter and 1-1/3 cups sugar; blend until smooth (about 1 minute).
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6
Add in vanilla, lemon extract, eggs, sour cream and blend well (about 30 seconds).
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7
Add in flour, salt, baking powder, baking soda; blend to make a smooth batter (about 30 seconds).
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8
Spoon batter into prepared baking pan.
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9
Spoon on cream cheese mixture topping (don't worry if there are open spaces).
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10
Drop jam dollups by teaspoonfuls over cake and cream cheese areas.
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11
Swirl the jam and the cream cheese topping to make a gentle marble effect.
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12
Bake for 35-40 minutes, or until cake is set and the topping seems dry.
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13
Cool completely and dust with powdered sugar.
