1. Preheat oven to 350° F. Spray a 9 x 5 baking dish (or similar size: should hold 1 quart) with cooking spray; set aside.
2. Prepare boudin by removing casing (if using links) and crumbling into small pieces (should be 1/2 inch or less in size). Tip: For best results, use your hands to crumble boudin. This way, you can feel any remaining pieces of casing or other undesirable parts and remove them. Once crumbled, set boudin aside.
3.  Using a stand mixer (or a hand mixer and a large bowl), mix cream cheese and sour cream on medium speed until smooth, about 5 to 7 minutes.  Add cheddar cheese, 2 tablespoons of green onion and sausage to bowl. Then, use a spatula to thoroughly mix all ingredients together. Pour dip mixture into prepared baking dish, spreading out and pressing it into an even layer.
4. Bake dip for 30 minutes or until cheese is melted and bubbly. Serve immediately with remaining 2 tablespoons of green onion garnished on top. 

Calories: 257, Fat: 22 g (11 g Saturated Fat), Cholesterol: 75 mg, Sodium: 397 mg, Carbohydrates: 4 g, Fiber: 0 g, Protein: 11 g.