1-First Step: Cut the chicken breasts in half lengthwise, then season them with salt and pepper to taste and coat lightly with flour for a nice sear.

2-Second Step: Heat 2 tablespoons of olive oil in a skillet over medium-high heat, then cook the prepared chicken for 4 to 5 minutes on each side until it turns golden, and set it aside to rest.

3-Third Step: In the same pan, melt 2 tablespoons of butter and add the 12 ounces of sliced mushrooms along with 1/4 teaspoon of Italian seasoning, stirring until the mushrooms release their water and get a good sear, then remove them from the pan.

4-Fourth Step: Add 3 cloves of minced garlic, 1/2 cup of chicken broth, 1/2 teaspoon of lemon juice, and 1/2 teaspoon of Dijon mustard to the pan, stirring to mix and reduce the liquid by half for a concentrated flavor base.

5-Fifth Step: Stir in 1 cup of heavy or whipping cream to create the sauce, then return the cooked chicken and mushrooms to the pan, simmering until the chicken is fully done and the sauce thickens nicely.

6-Final Step: Season the dish with salt and pepper to taste, then serve it hot for the best creamy mushroom chicken experience, perhaps alongside simple sides for a complete meal.