Slice 2 boneless skinless chicken breasts into thin strips. Sprinkle 2 Tbsp blackening seasoning evenly over the chicken, coating all sides.
Heat 2 Tbsp olive oil in a large skillet over medium-high heat. Add the seasoned chicken and cook for 5–7 minutes, stirring occasionally, until fully cooked and slightly blackened. Remove the chicken from the skillet and set aside.
Cook 12 oz fettuccine pasta according to package directions until al dente. Drain and set aside.
In the same skillet, reduce heat to medium and add 6 Tbsp butter. Once melted, stir in 1 Tbsp minced garlic and cook for about 1 minute until fragrant.Pour in 1 ½ cups heavy whipping cream and stir well. Bring to a gentle simmer.
Add 1 ½ cups grated parmesan cheese gradually, stirring continuously until the sauce is smooth and thickened.
Toss the pasta with the homemade Alfredo sauce.
Slice the chicken and serve it on top of the noodles with the Alfredo Sauce.