Creating the Summer Berry Poke Cake is simple if you follow this straightforward procedure:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9×13-inch baking pan.

2. Prepare Cake Batter: In a large bowl, combine the vanilla cake mix, eggs, water, and vegetable oil. Mix until fully blended and smooth.

3. Bake the Cake: Pour the batter into the prepared baking pan. Bake in the preheated oven for 30-35 minutes or until a toothpick inserted in the center comes out clean.

4. Cool the Cake: Remove the cake from the oven and let it cool in the pan for about 10 minutes. Then, turn it out onto a wire rack to cool completely.

5. Make Berry Pokes: Once the cake is cool, use the handle of a wooden spoon to poke holes throughout the cake, about 1 inch apart.

6. Prepare Berry Mixture: In a bowl, combine the sweetened condensed milk and a portion of the fresh berries. Gently mash the berries into the mixture.

7. Pour Mixture Over Cake: Pour the berry mixture over the poked holes in the cake, allowing it to soak in.

8. Make Whipped Cream: In a separate bowl, beat the heavy whipping cream, powdered sugar, and vanilla extract until stiff peaks form.

9. Top the Cake: Spread the whipped cream evenly over the cake.

10. Garnish: Decorate the top with additional fresh berries.