1 pound Brussels sprouts, trimmed
1 large sweet potato (about 1 pound), peeled and chopped into 1-2 cubes
2 cloves garlic, smashed
⅓ cup olive oil
1 teaspoon cumin
¼ teaspoon garlic salt
1 teaspoon salt
pepper, to taste
1 tablespoon red wine vinegar
thyme, fresh, to garnish