In a large pot, melt the butter over medium heat.
Once melted, add in the minced garlic clove. Sauté it until fragrant. Then, add diced onion and sauté until translucent.
Slowly pour in the chicken broth while stirring continuously. Bring to a boil and then reduce heat to low and simmer for 15 minutes.
Add in the cooked chicken, salt & pepper, garlic powder, Italian dressing mix, milk, lemon juice, all purpose flour and white wine. Stir to combine and simmer for additional 10-15 minutes until thickened.
Stir in the parsley and cooked rice then season with additional salt & pepper if desired.
Serve hot.