Cook the sausage in a non-stick pan over medium-high heat, using a ladle to break it into small pieces, until the sausage is browned all over and mostly cooked through, about 3 minutes.
Remove the sausage from the pan and place in a bowl.
Add the onion and bell pepper to the skillet and sauté until soft and beginning to brown, 5-7 minutes.
Reduce the heat to medium.
Add the garlic and cook, stirring often, until the garlic is fragrant and slightly golden, about 1 minute.
Stir in the corn and cook, stirring often, until the corn softens, about 1 minute.
Stir in the cream and Parmesan and cook, stirring often, until the cream thickens, about 30 seconds.
Stir in the pasta shells and lemon juice.
Toss to combine, and top with red pepper flakes and more lemon juice.
Enjoy!