Savory Croissant Breakfast Casserole with Garlic Butter

Name: Savory Croissant Breakfast Casserole with Garlic Butter
Ingredients: 1 lb breakfast sausage ((mild or hot)); 8 large eggs; 2 cups half and half; 1/4 cup cream cheese (softened); 1 teaspoon salt; ½ teaspoon black pepper; ½ teaspoon smoked paprika; ½ teaspoon dried thyme (or 1 1/2 teaspoons fresh); 1/3 cup shredded Gruyere cheese; 1/3 cup shredded white cheddar cheese; 6 large croissants (torn into pieces (or 20 mini)); ½ cup shredded Parmesan cheese; 4 tablespoon butter (melted); 2 cloves garlic (minced (about 1 teaspoon)); green onions or chives (to garnish)