Chop all of the vegetables (half butternut squash, 3 small potatoes, 3 beets, 3-5 small carrots, 1 red onion) into one inch cubes. Combine with smashed 1 head of garlic cloves and minced 4 sprigs fresh rosemary in large bowl. Cover with 2-4 tablespoons olive oil and toss to combine. You want just enough olive oil to lightly coat the vegetables without having any excess at the bottom of the bowl.
Using on large or two small lined baking sheets, spread vegetables out into a single layer.
Roast in preheated 425°F oven for 45 minutes to 1 hour, tossing once half way through cooking time, until veggies are fork tender.