In a medium bowl, sift together the flour, baking powder, baking soda. Whisk in the kosher salt and set aside.
2 (250 g) cups All purpose flour, 2 teaspoons Baking powder, ¼ teaspoon Baking soda, ½ teaspoon Kosher salt
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and sugar on high speed for 3 to 4 minutes until light and fluffy.
½ (113 g) cup Unsalted butter, 1 (200 g) cup Granulated sugar
Add in the eggs one at a time mixing well after each addition. Make sure to stop and scrape the bowl after each addition. Stir in vanilla extract.
2 large Eggs, 1 tablespoon Vanilla Extract
With the mixer on low, add the dry ingredients alternately with the sour cream, beginning and ending with the dry ingredients. After each addition, mix only until just combined, making sure to scrape the bottom and sides of the bowl with a rubber spatula. Remove the bowl from mixer and with a rubber spatula, gently fold the batter 2 to 3 times, making sure to scrape the bottom of the bowl to ensure there is no flour left. Batter will be thick.
1 (240 g) cup Sour cream
Pour the batter into the prepared pan and spread evenly using an offset spatula. Tap the pan a few times on the counter to release any air bubbles. Add the strawberry jam on top of the batter and using an offset spatula, spread jam in an even layer. Remove streusel from the fridge and sprinkle on top of the strawberry jam.
Bake for 55 to 60 minutes or until a toothpick inserted in the middle comes out clean with a few moist crumbs.
Remove cake from oven and place pan on a cooling rack. Let the cake sit in the pan for 1 hour to let the jam set. After 1 hour, transfer the cake from the pan to the cooling rack and allow it to cool completely. Sprinkle with powdered sugar or glaze if desired. Enjoy!!