Italian Broccoli Cauliflower Salad with Mozzarella

Ingredients

• ½ cup olive oil
• ¼ cup red wine vinegar
• 1 tablespoon Dijon mustard
• ½ teaspoon dried oregano
• ¼ teaspoon red pepper flakes
• pinch of salt
• 12 oz broccoli florets
• 12 oz cauliflower florets
• 12 oz jar roasted red bell pepper, drained
• 1 small can (2.25 oz) sliced black olives, drained
• 2 oz golden or red grape tomatoes
• 12 oz small, marinated mozzarella cheese balls, drained
• ¼ cup grated parmesan cheese
• ¼ cup chopped walnuts