01 - Preheat oven to 400°F.
02 - Coat beet with olive oil and sprinkle with salt. Wrap tightly in aluminum foil and place on a baking sheet.
03 - Roast wrapped beet in oven for 50 to 60 minutes until tender when pierced with a knife. Remove and let cool before peeling and chopping into chunks.
04 - Add roasted beet pieces, mixed berries, Greek yogurt, almond milk, honey or maple syrup (if using), lemon juice, and ice cubes to blender.
05 - Blend all ingredients until smooth and creamy.
06 - Taste smoothie and adjust sweetness or consistency if needed. Pour into glasses and serve immediately.