In the skillet, heat oil over medium-high heat. Add onion and mushrooms; cook, stirring occasionally, until tender, about 4 to 5 minutes. Add garlic; cook 2 minutes more. Stir in broth, crushed tomatoes, rosemary, and Worcestershire sauce. Bring to boiling; reduce heat to medium and simmer until thickened, about 5 minutes. Stir in meat, peas and carrots, remaining 1/2 teaspoon salt and 1/4 teaspoon pepper; cook 2 minutes. Divide mixture among prepared dishes. Spread top with butternut squash. Place on a large baking sheet.