Rinse the mixed salad greens under cold running water, ensuring that they're clean and fresh. Pat the greens dry with a clean kitchen towel or use a salad spinner to remove excess moisture. Once dried, place the vibrant greens in a large salad bowl.

Halve the cherry tomatoes, slice the cucumber into thin rounds, and dice the bell pepper. Add these freshly prepared vegetables to the bowl with the salad greens.

Thinly slice the red onion and sprinkle it into the bowl. Follow this with shredded carrots and sliced radishes for added texture. Gently toss to combine.

Slice the avocado in half, remove the pit, and add slices on top of the salad.

Crumble feta cheese over the salad for extra flavor, if using.

In a small bowl, whisk together olive oil, balsamic vinegar, and salt and pepper. Mix until emulsified.

Drizzle the dressing over the salad and gently toss to coat the ingredients.

Sprinkle fresh herbs over the top and serve immediately for the best flavor.