Warm Bow-Tie Pasta Salad

Ingredients:8 ounces uncooked farfalle (bow-tie pasta)2 tablespoons olive oil, divided1 1/3 cups julienne-cut red bell pepper (about 1 large pepper)1 cup sliced cremini mushrooms (about 2 ounces)1 cup thinly sliced shiitake mushroom caps (about 2 ounces)3 garlic cloves, minced3 tablespoons balsamic vinegar1 tablespoon Dijon mustard1/4 teaspoon salt6 cups gourmet salad greens1/2 cup (2 ounces) finely…