Preheat the oven broiler on low.
Cook pasta: In a pot of salted boiling water, cook the pasta according to the package directions. While pasta is cooking, prep ingredients.
Prep watermelon salad ingredients per instruction above.
Make watermelon salad: Combine all ingredients in a bowl. Season with salt and pepper to taste. Refrigerate until ready to serve.
Make garlic bread: Drizzle the bread with oil. Evenly sprinkle with garlic powder, oregano, salt and pepper. Place on a baking sheet.
Reserve 1/2 cup of the pasta water. Drain the pasta well and set aside.
Make the carbonara: In a bowl, whisk the egg and parmesan. Season with salt and pepper and set aside.
Heat the oil in a non-stick pan over medium heat. Saute the pancetta until browned. Add the butter and onion. Saute until golden brown. Stir in the pasta until fully combined with all the ingredients.
Remove from the heat and stir in the egg yolk parmesan mixture until smooth. Add a little of the reserved pasta water until the sauce is creamy. Season with salt and pepper to taste. Garnish with red pepper flakes if desired.
Place garlic bread under the broiler until golden brown.
Serve: Enjoy pasta with garlic bread, watermelon salad, and sparkling water.