These individual coffee cakes are such a treat! There is a layer of cake, then cream cheese, tart jam (or lemon curd), and streusel topping in every perfect bite.
12tablespoons[1 1/2 sticks or 170 g] unsalted butter, cut into 1 in [2.5 cm] pieces, at room temperature
1/2teaspoonbaking powder
1/2teaspoonbaking soda
1/2teaspoonfine salt
1cup[225 g] jam or lemon curd
Cream Cheese Filling
8ounces[227 g] cream cheese, at room temperature
1/4cup[50 g] granulated sugar
1large egg, at room temperature
Instructions
For the Cake
Position an oven rack in the middle of the oven and preheat the oven to 350F [180C]. Grease eight 4 in [10 cm] cake pans or springform pans, and line the bottoms with parchment paper. Or prepare a jumbo muffin pan or ramekins (see note).
In a medium bowl or liquid measuring cup, whisk together the sour cream, buttermilk, egg, and vanilla.
In the bowl of a stand mixer fitted with a paddle, combine the flour and granulated sugar on low speed. Add the butter, one piece at a time, beating until the mixture resembles coarse sand. Remove 1 cup [130 g] of the mixture and set it aside in small bowl.
With the mixer on low speed, beat in the baking powder, baking soda, and salt. Add the wet ingredients and mix until incorporated, about 30 seconds. Remove the bowl from the mixer. Scrape down the sides of the bowl and use a spatula to mix the batter a few more times. Divide the batter evenly among the prepared pans and smooth the tops with an offset spatula or the back of a spoon. Spread 2 tablespoons of jam evenly over the cake batter in each pan.
For the filling
In the stand mixer bowl in which you mixed the cake batter, beat together the cream cheese and granulated sugar on low speed until smooth and creamy. Add the egg and mix until incorporated, scraping down the sides as needed. Divide the cream cheese mixture among the pans and smooth the tops with an offset spatula or the back of a spoon. Divide the reserved flour-butter mixture among the pans, sprinkling it evenly over the tops. Tap the pans gently on the counter twice to help get rid of any air bubbles.
Place the cake pans on a large sheet pan and bake until golden brown and a wooden skewer or toothpick inserted into the center comes out with a few crumbs, rotating the pan halfway through baking, 26 to 32 minutes. Transfer the pans to a wire rack and let the cakes cool until barely warm or at room temperature.
Remove the cakes from their pans and serve. Alternatively, the cakes can be covered in plastic wrap after cooling and stored in the refrigerator overnight.
Notes
If you don't have 4 in [10 cm] cake pans, you can bake the cakes in jumbo muffin tins or ramekins. Fill the cavities a quarter of the way with batter, and spread only 1 tablespoon of jam on each one. Top with the cream cheese mixture and then the flour-butter mixture. Smaller cakes will bake faster, so start checking them a few minutes earlier. *Throughout my recipes posted on this website, 1 cup of flour equals 142g. Please note that 1 cup of flour can range anywhere from 120g to 142g, depending on the baker or website. I found that after weighting many cups of flour and averaging the total, mine always ended up around this number. Weighing your flour instead of using cup measurements is the surest way to get the result I intended when developing the recipe.