Preheat oven to 400°F (200°C). Rinse the beets under cold water.

Wrap each beet in aluminum foil and place on a baking sheet. Roast for 45-60 minutes until fork-tender. Let cool, then peel and slice into bite-sized pieces.

Wash and dry mixed greens thoroughly. Segment the orange.

In a large bowl, combine roasted beets, sliced avocado, citrus segments, and mixed greens.

Drizzle with olive oil and balsamic vinegar; season with salt and pepper. Toss gently to combine before serving.