Combine yeast, sugar and warm water. Let sit for 5 minutes or until yeast is puffy. Stir in whole-wheat flour, all-purpose flour, salt, olive oil, garlic powder and thyme. Bring dough together with your hands, and knead gently for 1 minute. Cover with a towel, and let rest and rise at room temperature at least 1 hour or up to 6 hours.