Swirled Blueberry Lemon Thyme Cake

Bahan-bahan (8 porsi)

• 1 stick (8 tablespoons) salted butter, at room temperature
• 1/2 cup + 1 tablespoon granulated sugar
• 1 tablespoon lemon zest
• 1/2 cup sour cream
• 2 teaspoons vanilla extract
• 3 large eggs, at room temperature
• 1 1/2 cups all purpose flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon kosher salt
• 1 1/2 cups fresh or frozen blueberries
• 2 tablespoons blueberry jam
• 2/3 cup powdered sugar
• 3 tablespoons lemon juice
• 1 -2 teaspoons fresh thyme leaves ((optional))