Acadian Beef Casserole

INGREDIENTS

• 1/2 cup vegetable oil
• 1/3 cup finely chopped onion
• 3 cloves garlic, minced
• 1 cup diced peeled carrot
• 1 1/2 cups diced celery
• 1 1/2 lbs ground chuck or 1 1/2 lbs very lean hamburger
• 20 small mushroom caps
• 1/2 cup sherry wine
• 1 (6 ounce) can tomato paste
• 1 (17 ounce) can diced tomatoes
• 1 teaspoon salt (to taste)
• 1/2 teaspoon black pepper
• 1/2 teaspoon dried oregano
• 1/2 teaspoon dried basil
• 1 (8 ounce) package small shell pasta
• 1 (10 ounce) package frozen chopped spinach
• 1/2 cup fresh bread, cubes buttered
• 1 cup grated sharp cheddar cheese
• grated parmesan cheese