Start by preheating the oven to 350°F and positioning a rack in the center. Then, lightly butter an 8 or 9-inch springform pan and dust it with flour.
In a medium bowl, whisk together 1 cup of flour, baking powder, salt, and cinnamon vigorously. Then, set it aside.
Start by beating butter with an electric mixer on medium-high for 2 minutes. Then, add sugar and continue beating until the mixture becomes light and fluffy, which should take about 1-2 minutes. Next, incorporate the vanilla extract, followed by adding the eggs one at a time, ensuring thorough blending while occasionally scraping the sides of the bowl. If you're using lemon zest, beat it in as well. Finally, reduce the mixer's speed to low and gradually introduce the flour mixture, beating until you achieve a smooth batter. The resulting batter will have a thick consistency.
Place the batter in the prepared pan, then use a spatula to smooth the top.
In a bowl, combine the berries with the remaining teaspoon of flour and the lemon juice. Then, spoon the berry mixture over the batter.
To achieve perfection, bake at 350°F for 45-55 minutes or until a clean tester emerges from the center.
Gently transfer the cake to a platter, ensuring the berry side is facing up. Sprinkle powdered sugar on top for a delightful presentation.