Start by dicing the watermelon into small, bite-sized cubes. Aim for uniform pieces so every bite gets a good mix of flavors. Finely dice the red onion and chop the fresh mint leaves. Crumble the feta cheese into small pieces to evenly distribute its flavor throughout the salad.
In a medium bowl, gently toss together the diced watermelon, crumbled feta, chopped mint, and diced red onion. This mix of ingredients will create a fresh and vibrant base for your salad cups.
In a small bowl, whisk together the olive oil, lemon juice, salt, and pepper. Adjust the seasoning to your taste. The dressing adds a lovely tang and richness that complements the sweetness of the watermelon and the saltiness of the feta.
Pour the dressing over the watermelon mixture and gently toss until everything is evenly coated. Be careful not to break up the watermelon cubes as you mix.
Spoon the salad mixture into your small cups or bowls, dividing it evenly. These salad cups are perfect for serving as individual portions at parties or as a light snack.
For the best taste and texture, serve the Watermelon Feta Mint Salad Cups immediately after assembling. If needed, refrigerate for up to an hour before serving to keep everything chilled and fresh.