Place the olive oil in a medium bowl. Stir in the chives, parsley, garlic, and thyme. Set aside to let flavors develop.
Place the lettuce in a large bowl. Top with the avocado, radishes, chopped asparagus, ribboned asparagus, and snap peas.
Whisk the sour cream into the bowl of olive oil and herbs. While whisking, slowly drizzle in the lemon juice. Season to taste with salt and pepper. Drizzle the dressing over the salad, gently toss to coat, and serve.