PREHEAT oven to 425° F. Line shallow roasting pan with foil.
PLACE squash, sweet potato, parsnip, leek and garlic in pan; drizzle with oil. Sprinkle with bouillon; toss to coat.
BAKE for 15 minutes; stir. Bake for an additional 10 to 15 minutes or until tender.
PUREE half of roasted vegetables with about 1 1/2 cups water in food processor or blender; cover and process until smooth or until desired consistency. Add more water as needed for processing. Pour into large saucepan. Repeat with remaining vegetables and remaining water.
STIR in evaporated milk, crushed red pepper and sage. Heat over medium-high heat until heated through. Serve with pepitas sprinkled over top.