Sweet and White Potato Salad with Mixed Greens

I found this today and thought it looked great to try!

Sweet and White Potato Salad with Mixed Greens
6 or more servings

1 large sweet potato
4 medium white potatoes, preferably Yukon Gold or red-skinned
1/2 cup vinaigrette (homemade or store-bought), or as needed to moisten potatoes
Salt and freshly ground pepper to taste
4 ounces (or as desired) mixed baby greens
1 cup (1/2 pint) cherry or grape tomatoes, halved
1 medium avocado, peeled and diced
Toasted pumpkin seeds for topping

Microwave the sweet potato for 3 minutes or so, just until done but still nice and firm. Then, microwave the white potatoes, starting with 5 minutes, then adding 1 minute until they, too, are done but still firm. Plunge the sweet potato and white potatoes into a bowl of cold water. If you prefer not to microwave, you can bake all the potatoes ahead of time.

When the potatoes are cool enough to handle, peel and cut into dice. Combine in a mixing bowl with vinaigrette; season with salt and pepper.

Line a large serving platter with the greens. Mound the potato mixture in the center.

Scatter the tomatoes and avocado around the perimeter of the salad. Top the potato mixture with a sprinkling of pumpkin seeds. Serve at once; pass around additional vinaigrette as desired.