In a large salad bowl, add mixed greens, cherry tomatoes, cucumbers, red onion, and pepitas. Toss to combine.
In a small bowl, combine the olive oil, red wine vinegar, Dijon mustard, honey, kosher salt, and black pepper. Whisk together until the dressing is fully emulsified and smooth.
Drizzle the vinaigrette over the salad just before serving. Toss gently with tongs or clean hands to evenly coat the greens, vegetables, and pepitas.
Serve immediately for the freshest taste and best texture.