PREHEAT oven to 400°F. Toss squash and red peppers with 2 Tbsp. of the dressing. Spread onto baking sheet.
BAKE 20 to 25 min. or until vegetables are crisp-tender; cool.
MIX mayo and remaining dressing in large bowl. Add pasta, vegetables, 1/2 cup of the basil and the seasonings; mix lightly. Serve immediately. Or, cover and refrigerate until ready to serve. Top with the remaining 1/4 cup basil just before serving.
serving size = 3/4 cup (175 mL)