Pitas with Smoked Sausage and Creamy Mustard Sauce

Serves:

• 1 package Hillshire Farm Smoked Sausage
• 2 teaspoons vegetable oil
• 1 onion, cut into thin wedges
• 1 green or red bell pepper, cut into strips
• 6 whole-wheat pita bread rounds
• For the Sauce:
• 1/3 cup plain non-fat yogurt
• 1/3 cup non-fat sour cream
• 1 tablespoon spicy brown mustard
• 1 small garlic clove, minced
• 1/8 teaspoon ground black pepper