Keto Caprese Chicken Bake

⏲ ~24 min total · prep 15 · cook 9 · 4 servings

By the KFI Test Kitchen · Tested & approved by Jason Lieu, KFI recipe editor

Published Sep 15, 2026 · Updated Sep 15, 2026

Ingredients

• 4 boneless skinless chicken breasts (6 oz each), pounded to 3/4-inch thickness
• 2 tbsp olive oil, divided
• 1 tsp garlic powder
• 1 tsp kosher salt
• 1/2 tsp black pepper
• 2 medium Roma tomatoes, cut into 1/4-inch slices
• 8 oz fresh mozzarella, sliced 1/4 inch thick and patted dry
• 1/4 cup grated Parmesan cheese
• 1/4 cup fresh basil leaves, torn
• 1 tbsp balsamic vinegar

Instructions

1. Position a rack in the upper third of the oven and preheat to 400°F.
2. Rub the chicken breasts all over with 1 tbsp of the olive oil, then season evenly with the garlic powder, salt, and pepper.
3. Heat the remaining 1 tbsp olive oil in a 12-inch oven-safe skillet over medium-high heat until it shimmers; sear the chicken 3 minutes per side, until deep golden brown.
4. Pull the skillet off the heat and lay a slice of tomato, then a slice of mozzarella, over each breast; shower everything with the Parmesan.
5. Transfer the skillet to the oven and bake 8-10 minutes, until the cheese is melted and bubbling and the thickest breast registers 165°F on an instant-read thermometer.
6. Rest 5 minutes, then scatter the torn basil over the top and drizzle each piece with the balsamic before serving straight from the skillet.

Why this recipe works

• Sear, then oven A 3-minute sear per side builds a golden crust in the skillet, so the oven only has to melt cheese and finish the centers. One pan does both jobs.
• Dry mozzarella melts better Fresh mozzarella carries a lot of water, so the recipe has you pat the slices dry. That keeps the cheese bubbling in place instead of pooling liquid over the chicken.
• Pounded even thickness Breasts pounded to 3/4 inch cook at the same rate edge to center. No dry shoulders waiting on a raw middle, and the 165°F check lands at the same time for all four.

Tips for making this recipe well

Pat the cheese, really

Blot both sides of each mozzarella slice with paper towels before it goes on the chicken. Wet cheese slides off the tomato layer and leaves a milky puddle you end up pouring off.

Trust the sear color

Deep golden brown at 3 minutes per side is the cue. If a breast still sticks to the skillet, it isn't ready to turn yet.

Upper rack placement

The rack in the upper third puts the cheese closer to the element, so it browns and bubbles inside the 8-10 minute window. On a lower rack the cheese melts but stays pale.

Rest before the basil

Give the bake 5 minutes off heat so the juices settle back into the meat. Basil goes on after the rest, or the heat bruises it dark.

Balsamic at the end

Drizzle the vinegar after the chicken leaves the oven. Cooked balsamic turns sharp and thin, while raw it stays round and syrupy.

Serving suggestions

This is the dinner we make when guests land on a weeknight and the budget of time is 45 minutes. It comes to the table in the skillet, basil scattered at the last second, and each serving sits at 3.5 net carbs, which leaves room for a vegetable side. Warm roasted broccoli or a big arugula salad with lemon works well here. Cut the breasts against the grain so every plate gets a layer of tomato and mozzarella with each slice. Cold leftover chicken over greens is a solid next-day lunch.

Storage and meal prep

Cool the leftovers and refrigerate them in a covered container for 3 to 4 days. The tomato and mozzarella release some water as they sit, so pour that off before reheating. Warm the chicken gently in a covered skillet, or eat a piece cold over salad, which is how we usually finish the fourth day. Freezing works if you wrap each breast tightly, and the meat itself keeps 2 to 3 months, though the fresh mozzarella turns grainy after thawing.

Variations worth trying

• Chicken thighs instead Swap in 6 boneless thighs and keep the same sear-and-bake plan. They need a few extra minutes in the oven, so check the thickest piece for 165°F.
• No balsamic Skip the vinegar and add a second tablespoon of torn basil with a pinch of salt over the tomatoes. The cheese and tomato carry it without the drizzle.
• Zucchini under the chicken Tuck 1/4-inch zucchini slices under the seared breasts before the pan goes into the oven so they cook in the drippings. Add about 5 minutes to the bake and test them with a paring knife.

Frequently asked questions

Can I make this ahead?

Sear the chicken and hold it in the fridge up to a day, then add the tomato and cheese and bake when you're ready. The bake from cold runs a few minutes longer, so lean on the thermometer.

How do I know the chicken is done?

The thickest breast should register 165°F at its center, which the recipe reaches after 8-10 minutes in a 400°F oven. The cheese looks melted before that, so trust the thermometer rather than the cheese.

Can I use dried basil?

Fresh basil is a finishing herb here, torn and scattered off the heat. Dried basil won't work the same way; add a small pinch to the sear seasoning instead and skip the garnish.

Why did my cheese slide off?

Usually the mozzarella was still wet or the tomato slices were thicker than 1/4 inch. Pat the cheese dry and keep the tomato slices even so the layers grip each other.

Is the 3.5 net carbs per serving?

Yes, each of the four breasts works out to 3.5 net carbs with the tomato, mozzarella, Parmesan, and balsamic included. Changes to those toppings change the number.

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