tuna casserole - my way!!!

Ingredients

• 1 - box macaroni & cheese dinner
• 2 - small cans tuna (drained)
• 1 - small can peas (drained)
• 1/2 cup kraft mayonnaise
• 1 can cream of celery or cream of mushroom soup (undiluted)
• 1 cup medium or sharp shredded cheddar cheese
• 1/4 teaspoon ground black pepper
• 1/2 teaspoon onion powder
• THE TOPPING:
• 1 cup medium or sharp shredded cheddar cheese
• 1 1/4 - sleeves ritz or townhouse crackers, crumbled/crushed
• 1 stick melted butter or margarine