Hearty Beef and Chicken Stew with Tomatoes and Herbs

1 lb (450g) beef stew meat, cut into cubes
1 lb (450g) boneless, skinless chicken thighs, cut into chunks
2 tablespoons olive oil
1 large onion, chopped
3 cloves garlic, minced
4 cups beef broth
1 can (28 oz) diced tomatoes
2 large carrots, sliced
2 celery stalks, sliced
2 potatoes, peeled and cubed
1 teaspoon dried thyme
1 teaspoon dried rosemary
1 teaspoon dried oregano
2 bay leaves
Salt and pepper to taste
Fresh parsley, chopped (for garnish)

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