Cook fettuccine according to the package instructions in boiling, lightly salted water. When the pasta is cooked, drain, rinse, and set aside until needed.
Pat the chicken tenders dry with a paper towel, then cut them into smaller pieces.
Add the all-purpose flour, salt, and black pepper to a shallow bowl. Whisk to combine.
Place the chicken pieces in the flour mixture. Toss to coat the pieces with the flour mixture.
Add two tablespoons of olive oil and butter to a large frying pan over medium-high heat.
When the pan is hot and the butter is melted, add the floured chicken to the pan and cook for 3-4 minutes.
Then turn the pieces over and cook for an additional 2-3 minutes or until the chicken has reached an internal temperature of 165 degrees F.
Remove the chicken from the pan, and add the sliced mushrooms to the same pan. Add additional olive oil if necessary. Sauté the mushrooms for 3-4 minutes.
Deglaze the pan with white wine (optional). Add the chicken back into the pan and cook for 1 minute.
Add the heavy cream, onion powder, and black pepper to the pan. Cook over medium-high heat for 2-3 minutes, or until the cream has thickened slightly.
Add the grated Locatelli Romano cheese to the pan, and reduce the heat to low. Stir to combine.
Add the fettuccine and chopped parsley to the pan. Reserve some of the parsley to use as a garnish.
Toss to combine and serve. Garnish with chopped parsley, Romano cheese, and black pepper.