Preheat your oven to 375°F.
Roll out the refrigerated pie dough into a pie dish, pressing it firmly against the edges.
Prick the bottom with a fork to prevent bubbling.
In a skillet over medium heat, cook the breakfast sausage until browned.
Transfer it to a paper towel-lined plate to drain excess grease.
Set aside.
In the same skillet, sauté the chopped onion until soft.
Add the kale and cook until wilted.
Remove from heat and combine with the sausage.
In a large bowl, whisk together eggs and heavy cream.
Add cheese into the mixture, stirring until evenly distributed.
Season with salt and pepper.
Spread the sausage and kale mixture evenly over the pie dough.
Pour the egg and cheese mixture over the top, ensuring it fills the crust.
Bake in the preheated oven for 45 minutes or until the quiche is set and golden brown.
Let cool slightly before slicing.