Start by cooking your egg noodles al dente according to the package instructions. This ensures they hold their shape in the creamy sauce and don’t turn mushy.
In a large skillet, melt butter over medium-high heat. Add diced onions, minced garlic, and thawed peas and carrots. Cook until onions are soft and translucent, about three minutes.
Sprinkle the flour over the vegetables and stir until fully combined with no white streaks. Pour in chicken broth and heavy cream, then bring to a gentle boil. Reduce heat and simmer until the sauce thickens, roughly five minutes.
Drain the cooked pasta and add it to the skillet along with the cubed chicken. Toss everything together until well coated in the creamy sauce. Adjust salt and pepper to taste and serve hot.