Spray a 9x13" casserole dish and set aside. Remove turkey sausage from their casings and cook in 1 Tbsp. olive oil in a large non-stick fry pan, season with salt, pepper and 1/2 tsp. onion powder. Cook until browned and cooked through. Remove from pan and place in a large bowl.
Add the other Tbsp. olive oil and saute onion and red pepper, season with salt and pepper. Cook until translucent and tender, do not brown. Remove to the bowl with the sausage.
Cook hash browns according to package until browned and heated through, season with salt and pepper. Toss in bowl with sausage and vegetables. Add 1 1/2 cups cheese and toss well. Pour into the prepared dish.
Meanwhile preheat oven to 350℉.
Whisk together milk, eggs, garlic powder, Tabasco sauce and 1/2 tsp. salt. Pour evenly over the turkey mixture. Top with remaining cheese.
Bake 350℉ for 40-45 min. Let cool for 5-10 min., garnish with chives, then slice and serve.