Preheat your oven to 375°F (190°C).
Prepare the pie crust in a 9-inch pie dish according to package instructions.
Cook the sausage in a skillet over medium heat until browned and cooked through, then drain excess fat.
In a large bowl, whisk together the eggs, heavy cream, salt, pepper, garlic powder, and thyme until well combined.
Stir in the cooked sausage and shredded cheese into the egg mixture.
Pour the filling into the prepared pie crust and smooth the top with a spatula.
Bake for 30-35 minutes, or until the quiche is set and lightly golden on top.
Allow the quiche to cool for 10-15 minutes before slicing.
Slice and serve warm or at room temperature.