Cook Pasta per instructions (al dente.)
In a large skillet, heat the olive oil over medium-high heat. Add the onion and sauté until translucent, but not browned.
Add the smoked salmon and continue cooking just until the salmon turns opaque,
1 to 2 minutes. Pour in the cream and add the capers.
Taste and adjust seasoning with salt and pepper. Be careful how much salt you add because the smoked salmon and capers are both salty.
Add the pasta and toss to coat. If there doesn't appear to be enough sauce, add a couple of tablespoons of the pasta cooking water to thin it down.
Serve with freshly grated Parmesan cheese.