Fettuccine Shrimp Casserole

Ingredients

• 6 ounces uncooked fettuccine
• 1 large egg
• 3/4 cup half-and-half cream
• 1/2 cup sour cream
• 1/2 teaspoon salt
• 2 cups shredded cheddar cheese
• 1/4 cup canned chopped green chiles
• 3 green onions, thinly sliced
• 1 tablespoon each minced fresh cilantro, basil and marjoram
• 1 pound uncooked shrimp (31-40 per pound), peeled and deveined or frozen cooked crawfish tail meat, thawed
• 1 cup salsa
• 1/2 cup shredded pepper jack cheese
• 2 cups tortilla chips, crushed
• 2 plum tomatoes, chopped
• 1 medium ripe avocado, peeled and sliced