Cake Batter
2 cups (4 sticks) unsalted butter, room temperature
4 ounces cream cheese, room temperature
2 1/4 cups granulated sugar
2 large eggs, room temperature
1/2 teaspoon fine sea salt
1 1/2 cups all-purpose flour
1 1/2 teaspoons vanilla extract

Cream Cheese Layer

4 ounces cream cheese, room temperature
1 egg, room temperature
1/3 cup granulated sugar
1/2 teaspoon vanilla extract