Boil a large salted pot of water for your pasta and cook it al dente according to package directions.
Meanwhile, season the salmon with the onion powder and some salt & pepper
Add the olive oil and butter to a skillet over medium-high heat. Once it's hot, cook the salmon for a couple of minutes on each side. Transfer the salmon to a plate and set aside.
Reduce the heat to medium. Add the flour to the skillet and cook for about 30 seconds, stirring nearly constantly
Whisk in the garlic and wine (let it bubble for 20 seconds or so), followed by the cream and lemon juice.
Once the sauce is smooth, whisk in the parmesan.
Add the salmon back in the pan and break it up with your spoon so it's in bite-size pieces. Gently mix it in with the sauce. Cook for an additional 3-5 minutes or so until the sauce is thickened and the salmon is cooked through.
Drain the pasta and add it to the skillet, along with about 1 tablespoon of the water you cooked the pasta in (or more if you want to thin the sauce) as well as the parsley. Gently toss the sauce and pasta. Serve immediately with extra parmesan cheese if desired.
