Step 1: Prep the Oven and Season the Chicken - Start by preheating your oven to 375 degrees and lightly greasing a 9 by 13 baking dish. This is one of those small steps that makes cleanup easier later, and trust me, you will appreciate that. In a large bowl, add your chicken breasts along with the salt, pepper, and garlic powder. Give everything a good toss so the chicken is evenly coated. This seasoning step builds the base flavor and makes sure every bite is well seasoned.
Step 2: Sear the Chicken for Flavor - Heat the olive oil in a large skillet over medium high heat. Once it is hot, add the chicken and let it sear for about three to four minutes on each side. You are not cooking it all the way through here, just giving it some color. That golden crust adds a lot of flavor and makes a big difference in the final dish. Once done, transfer the chicken to your prepared baking dish.
Step 3: Make the Creamy Caesar Sauce - In a medium bowl, combine the Caesar dressing, sour cream, softened cream cheese, chicken broth, and minced garlic. Stir until everything is smooth and well blended. It might take a minute for the cream cheese to fully mix in, but just keep stirring. Once smooth, add the grated Parmesan and give it another mix. This sauce is where all the magic happens, so take a moment to appreciate how good it smells already.
Step 4: Assemble and Add the Cheese - Pour the creamy Caesar sauce evenly over the chicken in the baking dish, making sure each piece is well covered. Then sprinkle the shredded mozzarella over the top. Do not be shy here. This is what gives you that irresistible cheesy layer that bubbles up and turns golden in the oven.
Step 5: Bake Until Golden and Bubbly - Place the dish in the oven uncovered and bake for about 30 minutes. You are looking for the chicken to be fully cooked and the cheese on top to be melted and bubbling. The sauce will thicken as it bakes, wrapping everything in that creamy goodness.
Step 6: Rest and Finish with Fresh Herbs - Once it comes out of the oven, let it sit for about five minutes. This helps the sauce settle and thicken just a bit more. If you like, sprinkle some chopped parsley on top for a little freshness and color. Then serve it up while it is still warm and enjoy every bite.