INGREDIENTS
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Topping
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1 1/2 cups (210g) flour
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2/3 cup (120g) packed light brown sugar
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1 tablespoon ground cinnamon
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1/4 teaspoon salt
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1/2 cup (115g) unsalted butter, cubed and melted
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1 1/2 teaspoons vanilla extract
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Cake
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1/2 cup (115g) unsalted butter, cubed, at room temperature
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3/4 cup (150g) granulated sugar
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2 cups (280g) flour
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1/2 teaspoon salt
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1/2 teaspoon baking powder, preferably aluminum-free
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1/4 teaspoon baking soda
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3/4 cup (180g) plain whole milk yogurt or sour cream
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1 large egg, at room temperature
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1 egg yolk
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2 teaspoons vanilla extract
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optional: Powdered sugar, for dusting the cake