Cook pasta according to package directions, omitting salt and fat. Drain pasta over a bowl; reserve 1/2 cup cooking liquid.
While pasta cooks, heat a small nonstick skillet over medium heat. Add nuts; cook 4 minutes or until golden brown, stirring frequently.
Heat a large skillet over medium heat. Add oil; swirl to coat. Add onion, raisins, and garlic; cook 8 minutes or until onion begins to brown, stirring frequently.
Add bell peppers; cook 4 minutes or until heated, stirring occasionally.
Add pasta and 1/2 cup reserved cooking liquid; cook 1 minute, stirring to combine.
Remove from heat; stir in feta, mint, basil, and black pepper. Sprinkle with nuts.