Zucchini Casserole

Ingredients

• 1 medium to large onion
• 1 1/2 lb. hamburger
• 1 small can mushrooms
• 2 Tbsp. flour
• 1 tsp. salt
• 1/4 tsp. pepper
• 1 tsp. onion salt
• 1/2 tsp. seasoned salt
• 1/2 tsp. garlic salt
• 1 tsp. Accent
• 1/2 tsp. Italian seasoning
• 2 medium squash, sliced
• 1 c. tomatoes
• 1 Tbsp. vinegar