Creating Berry Bliss Sheet Cake is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9×13-inch sheet pan.
2. Mix Dry Ingredients: In a large bowl, sift together the flour, baking powder, and salt.
3. Cream Butter and Sugar: In another bowl, cream together the softened butter and granulated sugar until light and fluffy.
4. Add Eggs and Vanilla: Beat in the eggs one at a time, followed by the vanilla extract, mixing well after each addition.
5. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, alternating with the milk, until just combined.
6. Add Berries: Gently fold in the mixed fresh berries, being careful not to overmix.
7. Pour Batter: Pour the batter into the prepared sheet pan and spread it evenly.
8. Bake: Place in the preheated oven and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
9. Cool the Cake: Remove from the oven and let it cool in the pan for 20-25 minutes. Then transfer to a wire rack to cool completely.
10. Prepare Icing: In a small bowl, whisk together the powdered sugar and lemon juice until smooth.
11. Frost the Cake: Once the cake has cooled, spread the icing over the top and garnish with additional fresh berries.

Following these steps will help you create a stunning and delicious Berry Bliss Sheet Cake that everyone will love!