Combine first 3 ingredients in a microwave-safe 1-quart liquid measuring cup; microwave at HIGH for 4 minutes. Stir to form small curds. Strain through a sieve lined with a double layer of cheesecloth; let stand for 5 minutes. Discard liquid. Scrape cheese mixture into a small bowl; stir in rind and 1/4 teaspoon salt.
Cook pasta according to package directions, omitting salt and fat, and drain.
Heat a large skillet over medium-high heat.
Add olive oil to pan; swirl to coat.
Add squash and zucchini to pan; saut 1 minute.
Add 1/4 teaspoon salt, tomatoes, and garlic; saut 4 minutes.
Add broth and pasta to pan, and cook for 2 minutes or until thoroughly heated, tossing to combine.
Place 2 cups pasta mixture in each of 4 shallow bowls; sprinkle each serving evenly with remaining 1/2 teaspoon salt and pepper. Top each serving with 2 tablespoons cheese mixture and 1 tablespoon mint.