In a large pot of salted boiling water, cook the linguine according to package directions until al dente. Drain and set aside, reserving a cup of pasta water.
In a bowl, toss the shrimp with Cajun seasoning until well coated.
In a large skillet over medium heat, heat the olive oil. Add the minced garlic, diced bell peppers, and onion. Sauté for about 3-4 minutes until the vegetables are softened and fragrant.
Push the sautéed vegetables to one side of the skillet. Add the seasoned shrimp to the empty side and cook for 2-3 minutes per side until they turn pink and opaque. Mix the shrimp with the vegetables.
Reduce heat to low. Pour in the heavy cream and add the grated Parmesan cheese. Stir until the cheese melts and the sauce thickens slightly. Add lemon juice, and season with salt and pepper to taste. If the sauce is too thick, add some reserved pasta water to reach desired consistency.
Add the cooked pasta to the skillet and toss everything together until the pasta is well coated in the creamy sauce. Heat through for an additional minute.
Divide the pasta among plates, and garnish with chopped parsley for freshness.
Notes
Serve in shallow bowls with an extra sprinkle of Parmesan and a slice of lemon on the side for a pop of color.