Preheat your oven to 350°F (175°C). Line a 9-inch springform pan or regular cake pan with parchment paper for easy removal.
In a large mixing bowl or the bowl of a stand mixer, cream together the softened butter and granulated sugar for 4 to 5 minutes, until the mixture becomes light and pale in color.
Add the eggs one at a time, beating well after each addition to fully incorporate.
Stir in the vanilla extract.
In a separate bowl, sift together the all-purpose flour, baking powder, and salt.
Alternately add the flour mixture and sour cream to the wet ingredients, beginning and ending with the flour mixture. Mix thoroughly after each addition to ensure a smooth batter.
Gently fold in the sliced strawberries until evenly distributed.
Pour the batter into the prepared pan and use a spatula to smooth the top.
Evenly sprinkle the 3 tablespoons of granulated sugar over the surface of the batter.
Bake in the preheated oven for 40 to 45 minutes, or until the top turns lightly golden and a toothpick inserted into the center comes out clean.
Allow the cake to cool completely before removing it from the pan.
If desired, dust the top with powdered sugar, slice, and serve. Enjoy!