To prepare herb mixture, combine first 6 ingredients on a cutting board; finely chop, and reserve 3 tablespoons. Set remaining herb mixture aside.
To prepare the dressing, place the reserved 3 tablespoons herb mixture in a food processor. Drop 2 garlic cloves through the food chute with food processor on; process until minced. Add cottage cheese and next 6 ingredients (cottage cheese through dash of pepper) to food processor; process until smooth. Stir in feta.
To prepare salad, steam broccoli, covered, 5 minutes or until crisp-tender. Cool. Combine remaining herb mixture, broccoli, mushrooms, and remaining ingredients in a large bowl. Pour dressing over salad; toss well.