Pesto Pasta with Green Beans and Potatoes

INGREDIENTS

• 1/2 pound dry penne pasta
• 4 red potatoes, cut into 1/4 inch slices
• 1/4 pound fresh green beans, cut into 2 inch pieces
• 1 tablespoon olive oil
• 1 clove garlic, minced
• salt and pepper to taste
• 1/2 cup plain yogurt
• 1/3 cup pesto
• 1/4 cup grated Parmesan cheese