In a large skillet over medium-high heat, cook the sausage, onion, peppers, and garlic until the sausage is browned and fully cooked and the vegetables are tender.
Sprinkle the flour over the sausage mixture and stir to combine. Cook for an additional 1-2 minutes. Remove from heat and set aside.
In a large mixing bowl, whisk together the eggs, heavy cream, salt, and pepper until well combined.
Evenly spread the sausage mixture into the prepared hash brown pie crust, sprinkle the shredded cheddar cheese over the sausage mixture.
Pour in the egg mixture over the sausage and cheese, making sure it fills all the gaps.
Reduce the oven temperature to 350°F (175°C).
Bake the pie for 30-35 minutes, or until the eggs are set and the top is golden brown. A knife inserted into the center should come out clean. Allow the pie to cool for at least 15 minutes.
Once cooled, garnish the pie with chives and crumbled bacon if desired. Serve warm and enjoy!