In a large skillet over medium heat, melt butter or oil. Once hot, add the sausages and cook until browned. Remove and slice thinly.
Preheat oven to 350F and line an 11×17 inch rimmed baking sheet with parchment paper, leaving an overhang for easy removal. Grease the parchment.
In a blender, combine the eggs, cream cheese, whipping cream, salt, pepper, and garlic powder. Blend until smooth. Pour mixture into prepared baking pan and spread to the edges.
Bake 15 to 18 minutes, until omelet is just cooked through. Remove and immediately sprinkle with 1 cup of the cheddar cheese. Sprinkle with sliced sausage.
Working from one of the shorter ends, roll omelet up tightly. Use the parchment paper to help lift the omelet to roll it. Sprinkle with the remaining cheddar and bake another 5 minutes, until cheese is melted. Slice and serve!