Slice the chicken breast down the middle to form a pocket in the chicken

Add in your cheese slices and ham

Close chicken up with either toothpicks or kitchen twine

Mix together the panko and the tarragon

Roll the breasts in the mixture

Heat a large pan on medium high heat and add in the oil

When the oil is heated, add in your breasts and cook for a minute or two on each side

Place breasts in an oven preheated to 350 degrees and cook for 25-30 minutes or until juices run clear

While chicken is cooking, grab up a large saute pan, add the butter and melt it on medium heat

Add in the mushrooms and cook for a minute or two

Add in the garlic, onion, tarragon, and salt and cook for an additional 2 to 3 minutes

Add in the flour and stir to coat

Add in the wine and chicken broth and allow the sauce to heat back up and thicken

Once thickened, remove from heat and stir in the half & half and fresh parsley

Add additional salt if needed

Pour over cordon bleu and serve