Turkey Sweet Potato Shepherd's Pie

WHAT YOU'LL NEED

• 2 Tbsp. (30 mL) oil
• 1 onion, chopped
• 2 cups (500 mL) hot water
• 1 Knorr® Vegetable Bouillon Cube, crumbled
• 1/4 cup (60 mL) all-purpose flour
• 2 cups (500 mL) 1/2-inch (1.5 cm) cubes cooked turkey
• 2 cups (500 mL) bite-size pieces assorted cooked vegetables
• 2 cups (500 mL) leftover mashed sweet potatoes or mashed white potatoes, heated*
• 2 Tbsp. (30 mL) grated Parmesan cheese