Watermelon and Feta Salad with Arugula and Spinach

3 tablespoons extra-virgin olive oil

2 teaspoons white balsamic vinegar

½ teaspoon kosher salt

2 cups arugula

2 cups baby spinach leaves

1 cup thinly sliced red onion

1 cup grape tomatoes, halved

½ cup crumbled feta cheese

2 cups bite sized watermelon chunks

Whisk the olive oil, white balsamic vinegar, and salt together in a small bowl; set aside.

Combine the arugula, spinach, onions, and tomatoes in a large salad bowl. Drizzle the vinaigrette over the salad mixture; toss to coat. Add the feta cheese and watermelon to serve.