Creating Vanilla Berry Cake is straightforward when you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.

2. Mix Dry Ingredients: In a large bowl, sift together the all-purpose flour, baking powder, and salt.

3. Cream Butter and Sugar: In another mixing bowl, cream the softened butter and granulated sugar until light and fluffy.

4. Add Eggs and Vanilla: Beat in the eggs one at a time, then stir in the vanilla extract until well combined.

5. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, alternating with the milk. Mix until smooth and no lumps remain.

6. Fold in Berries: Gently fold in the mixed berries, ensuring they’re evenly distributed throughout the batter.

7. Divide Batter: Pour the batter evenly into the prepared cake pans.

8. Bake: Place in the preheated oven and bake for 30-40 minutes, or until a toothpick inserted in the center comes out clean.

9. Cool: Remove from the oven and let the cakes cool in their pans for about 20 minutes. Then transfer them to wire racks to cool completely.

10. Prepare Frosting: In a mixing bowl, whip the heavy cream with powdered sugar until soft peaks form.

11. Assemble the Cake: Once the cakes are completely cool, place one layer on a serving platter. Spread a layer of whipped cream frosting on top, then add the second layer.

12. Frost the Top: Spread the remaining whipped cream on top of the second layer, and decorate with additional fresh berries.