Preheat oven to 350 degrees.
Cook the mushrooms in a pan on high flame until soft and browning. Take off the flame and leave aside.
Heat the oil then mix the crushed almonds with the pepper, salt and garlic in. Cook on high flame for about 3-4 minutes then take off the fire and cool for 3 minutes.
Mix the mushrooms and mozzarella cheese into the almond mix.
Cut a slit in the side of the chicken breats and stuff wiith the mixture.
Place on a prepped baking sheet lined with greased parchment paper. Mix the mayo and mustard together and coat the top part of each piece of chicken.
Bake for 40 minutes. For best results serve with Harlan's Mouth Watering Gravy recipe on top which can be found in the Sauce's and Rubs category.