Simple. Easy. Seasonal : Crostata, Galette, Free-Form Pie.
My go-to summer dessert is always a crostata. I love the feel of making one batch of dough in my hands though it is easy enough to make multiple batches ahead of time.

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Bring your favorite pie dough together. While the dough rests, prepare your choice of ripe summer fruit by pitting and slicing. Roll out the dough to a rough circle or oval. Layer on the fruit. Fold up the sides. Bake. Enjoy with friends.
So easy and it is impressive to bring to a summer table at the end of a great meal.