Creating the Summer Berry Poke Cake can be straightforward if you follow these simple steps:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C). Grease a 9×13-inch baking dish.

2. Prepare the Cake Mix: In a large mixing bowl, prepare the yellow cake mix according to the package instructions. Combine the mix with the required eggs, water, and oil, mixing until smooth.

3. Bake the Cake: Pour the batter into the greased baking dish. 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 15 minutes.

5. Poke the Cake: Use the handle of a wooden spoon to make holes all over the top of the cooled cake, spacing them about 1 inch apart.

6. Prepare the Gelatin: In a bowl, combine the berry-flavored gelatin with 1 cup of boiling water. Stir until dissolved.

7. Pour Gelatin over Cake: Carefully pour the gelatin mixture over the poked cake, ensuring the liquid fills the holes. Let it absorb for about 30 minutes.

8. Chill the Cake: Place the cake in the refrigerator to chill for at least 2 hours, allowing the flavors to meld.

9. Add Topping: Once chilled, spread the whipped cream evenly over the top of the cake.

10. Decorate: Top the cake with fresh berries and mint leaves for an attractive presentation.

These straightforward steps will allow anyone to create a delightful Summer Berry Poke Cake with impressive flavor and aesthetics.