Preheat the oven to 400°F.

Place each beet on a piece of foil. Drizzle generously with olive oil and sprinkle with salt and pepper. Wrap the beets in the foil, place on a baking sheet, and roast for 35 to 60 minutes, or until fork-tender. The timing will depend on the size and freshness of the beets.

Let the beets cool and chill them in the fridge until ready to use.

Slice the beets into 1/4-inch-thick rounds. Assemble the salad with the greens, shallots, apples, beets, walnuts, cheese, and microgreens, if using. Drizzle with balsamic vinaigrette. Season with flaky sea salt and pepper and serve.