Wash and rinse all vegetables
Slice zucchini, yellow square, and carrots into 1 inch pieces
Slice sweet potatoes into 1 inch cubes
Slice onions into quarters, then separate each quarter in half
Add all vegetables into a large pot or bowl for mixing
Add olive oil, balsamic vinegar, thyme and rosemary to a small bowl
Press or dice the garlic and add to the small bowl with the rest of the oil and spices and mix
Pour the oil and spice mixture over the bowl full of sliced vegetables
Mix the vegetables with a large wooden spoon until evenly coated
Preheat the oven to 450
Cover two baking pans with aluminum foil (to make clean up easier)
Spread vegetables evenly on the baking pans
Cook vegetables for a total of 40 minutes, turning them once after 20 minutes