Preheat the oven to 400 degrees F.

Heat the sausage in a large oven-safe skillet or dutch oven. Break it apart with a wood spoon or meat chopped until it is crumbled. Cook, browning all over, until golden and crisp, about 6 to 8 minutes.

Remove the sausage with a slotted spoon and transfer it to a plate. Leave any of the oil from the sausage in the pan. If needed, you can add a drop of olive oil here.

Keep the skillet over medium heat and add the onion and garlic. Add a pinch of salt and pepper. Add the pepper flakes. Cook, stirring often, until softened and golden, about 4 to 5 minutes. Add the broccoli into the pan with another pinch of salt and pepper.

Add in the cheese tortellini and the stock. Stir it well, then add in the parmesan cheese. Stir again so everything is combined.

Top with the mozzarella cheese. Bake for 20 to 25 minutes, until golden and bubbly and melty.

Serve with extra parmesan and crushed red pepper on top!