Heat oven to 400°. Combine broccoli and onion in glass bowl and microwave, covered, on high for 2 to 3 minutes or until broccoli thaws. Add cottage cheese, butter and eggs; mix well. Add muffin mix. Stir just until moistened. Pour into greased 9x9-inch baking pan. Bake for 35 minutes or until golden brown. Yields 9 servings.