Beef Stroganoff Over Zoodles

Name: Beef Stroganoff Over Zoodles
Ingredients: 2 lbs chuck roast cut into 2 cubes; salt and pepper; 5 TB olive oil divided; 1 medium onion chopped; 3 cups beef broth if I don't have homemade on hand I buy low sodium; 4 TB butter unsalted and divided; 1 lb mushrooms sliced; 4 or 5 cloves garlic minced and divided; 3 or 4 sprigs fresh thyme; 3 TB sour cream plus more for garnish if you like; 2 TB Dijon mustard; 1/4 cup fresh parsley roughly chopped plus more for garnish; 5 or 6 medium zucchini and/or yellow squash I like a combination spiralized or grated into zoodles