Dry ingredients. In a medium bowl, whisk together 1 3/4 cup flour, 1/2 teaspoon baking powder, and 1/2 teaspoon salt.
Cream butter and sugar. In the bowl of a stand mixer fitted with a paddle attachment, cream 1/2 cup butter and 4 ounces cream cheese together on medium speed until fluffy. Add 1 cup sugar on medium-high speed until pale and airy. Mix in 1 large egg and 1 Tablespoon vanilla until combined. Using a rubber spatula, scrape the bottom of the sides and bottom of the bowl.
Combine and chill dough. Mix in the dry ingredients on low until just combined. Chill at least 1 hour.
Line pan with parchment paper. Preheat the oven to 375°F.
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