Step 1: Preheat and Season the Chicken - Start by preheating your oven to 375 degrees and lightly greasing a 9 by 13 baking dish. Grab a large bowl and add your chicken breasts along with the salt, pepper, and garlic powder. Give everything a good toss so each piece is evenly coated. This step might seem simple, but seasoning early makes a big difference in the final flavor.
Step 2: Sear the Chicken for Flavor - Heat the olive oil in a large skillet over high heat. Once the oil is hot, add the chicken breasts and sear them for about 3 to 4 minutes per side. You are not trying to cook them all the way through here. You just want a light golden color on the outside. This adds a layer of flavor that really makes the dish stand out. Once done, transfer the chicken to your prepared baking dish.
Step 3: Mix the Creamy Caesar Sauce - In a medium bowl, combine the Caesar dressing, sour cream, softened cream cheese, chicken broth, and minced garlic. Stir until smooth and well blended. Then add the grated parmesan cheese and mix again. The sauce should be creamy and pourable. This is where all that rich Caesar flavor comes together.
Step 4: Assemble the Dish - Pour the creamy sauce evenly over the chicken in the baking dish, making sure each piece is well covered. Then sprinkle the shredded mozzarella cheese across the top. Do not rush this step. A good even layer of cheese means every bite gets that melty goodness.
Step 5: Bake Until Bubbly and Golden - Place the dish in the oven uncovered and bake for about 30 minutes. You are looking for fully cooked chicken and a top layer of cheese that is melted and bubbling. The edges should be just starting to turn golden. Once it is done, let it sit for about 5 minutes. This helps the sauce thicken slightly.
Step 6: Finish and Serve - If you are using parsley, sprinkle it over the top just before serving. It adds a nice pop of color and a little freshness. Serve warm, preferably over mashed potatoes, rice, or even pasta to soak up all that creamy sauce.