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1
Heat the oven to 350u00b0F and arrange a rack in the middle of the oven.
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2
Coat an 8-by-8-inch baking dish with butter and set aside.
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3
For the topping:
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4
Using a pastry blender or your fingertips, work brown sugar, flour, butter, cinnamon, and salt together until ingredients come together but some pea-size pieces remain. Stir in pecans, cover, and refrigerate until ready to use.
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5
For the batter:
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6
Whisk flour, baking powder, and salt together in a medium bowl until evenly combined; set aside.
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7
Whisk together milk and vanilla extract in a small bowl until evenly combined; set aside.
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8
Combine sugar and butter in the bowl of a stand mixer fitted with the paddle attachment and beat on medium speed until light in color and fluffy, about 3 minutes.
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9
Add eggs one at a time, letting the first completely incorporate before adding the second.
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10
Add 1/3 of the flour mixture and mix on low until just combined; scrape down the sides of the bowl.
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11
Pour in 1/2 of the milk mixture and mix on low until just incorporated.
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12
Repeat, alternately adding dry and wet ingredients and ending with dry ingredients, until completely incorporated.
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13
Remove bowl from mixer, fold plums in until coated and evenly distributed, and turn into prepared baking dish.
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14
Sprinkle topping evenly over batter and bake until a tester inserted into the center comes out clean and the top is golden brown, about 45 to 50 minutes.
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15
Remove from the oven and let cool at least 20 minutes before serving.
