In a small bowl mix together mustard, thyme, salt, and pepper. Sprinkle evenly over both sides of the chicken breasts. Heat oil in a large skillet over medium heat.
Add chicken breasts and cook on both sides until golden brown and the internal temperature has reached 165 degrees. Remove from the pan and slice into strips.
Cook rotini pasta according to package directions. While pasta is cooked melt the butter in a large skillet over medium heat. Add flour and mix well with the butter to combine. Add wine, garlic, onion, and Dijon mustard. Cook for about 5 minutes. Reduce heat to low and slowly add milk stirring to combine. Cook until the mixture begins to thicken. Add white cheddar cheese and stir it into the sauce until it has melted.
Drain noodles and transfer them to a large serving bowl. Mix in white cheddar sauce, add the chicken and toss until well combined. Season with thyme, oregano, and crushed red pepper flakes. Top with Parmesan cheese while serving.