Cook pasta according to package instructions. Drain and rinse with cold water. Allow it to cool while prepping other ingredients.
Cut broccoli and cauliflower florets into bite-sized pieces. Cube cheese. Cut pepperoni into quarters. Cut tomatoes and olives in half. Combine all ingredients, including pasta, in a large bowl.
Mix Dorothy Lynch and Italian dressing together. Use a 2 ½ to 3 cup container with a tight-fitting lid and shake dressings to combine. Pour over pasta salad ingredients and toss to coat.
Cover and refrigerate for 1 hour or more before serving.