Keto Chicken Breast Recipes: Creamy Mustard Spinach

• The skillet-to-oven method gives thick chicken breasts a more even path to doneness. Browning builds flavor first, while the covered oven finish lets the center catch up without repeatedly turning the meat or thinning the sauce.
• Dijon brings sharpness that balances cream and Parmesan without requiring a long spice list. Garlic, thyme, lemon, and pepper flakes keep the sauce savory and bright, so it works with mild chicken and greens.
• Spinach is added after the sauce has reduced, which prevents it from disappearing into the pan too early. The finished skillet also scales neatly for four portions and leaves the stovetop open for a simple vegetable side.

• 2 lb chicken breasts (900 g)
• 1 teaspoon fine salt (6 g)
• 1/2 teaspoon black pepper (1 g)
• 1 teaspoon fresh thyme (1 g)
• 1 tablespoon olive oil (14 g)
• 2 tablespoons unsalted butter (28 g)
• 3 garlic cloves, minced (9 g)
• 1/4 teaspoon red pepper flakes (0.5 g)
• 1/2 cup vegetable broth (120 g)
• 1/2 cup heavy cream (120 g)
• 2 tablespoons Dijon mustard (30 g)
• 1/3 cup grated Parmesan (30 g)
• 5 ounces spinach (140 g)
• 1 tablespoon lemon juice (15 g)

Ingredient notes

• Choose breasts close in size so they reach the same doneness point. If one end is thinner, fold it under before seasoning. Thicker pieces suit the oven finish because the sauce can reduce while their centers finish cooking.
• Heavy cream gives the sauce body and helps it cling to sliced chicken. Half-and-half creates a looser result, so reduce the broth slightly first and expect a lighter finish around the spinach.
• Dijon mustard provides acidity, salt, and a gentle bite in one spoonful. Use a smooth Dijon rather than whole-grain mustard if you want the sauce to stay glossy and uniform after adding Parmesan.
• Freshly grated Parmesan melts more evenly than larger packaged shreds. Add it over low heat and stir steadily, since high heat can make a dairy-based sauce look grainy rather than smooth.
• Baby spinach wilts quickly and needs no precooking. Mature spinach works too, but remove tough stems, chop the leaves, and add them in two additions so the sauce stays in the skillet.

1. 1Heat the oven

   Set the oven to 375°F. Pat the chicken dry, then season both sides with salt, pepper, and thyme. Dry surfaces brown more readily, while even seasoning gives the finished sauce a consistent base. Place an ovenproof skillet over medium-high heat and gather the remaining ingredients beside the stove.

   

2. 2Brown the chicken

   Add olive oil to the hot skillet. Lay in the chicken breasts with space between them and cook until the first side is deeply golden, about 4 minutes. Turn and cook the second side for 2 minutes. Transfer the chicken to a plate; it will finish cooking later.

   

3. 3Build the sauce

   Lower the heat to medium and add butter. When it foams, stir in garlic and red pepper flakes for 30 seconds. Pour in chicken broth, scraping the browned bits from the skillet. Let the broth bubble for 2 minutes, concentrating the savory flavor left from the chicken.

4. 4Add creamy elements

   Stir in cream and Dijon until the sauce looks smooth. Simmer for 2 to 3 minutes, stirring around the edges where it thickens first. Reduce heat to low, then add Parmesan a little at a time. Stir until melted and keep the sauce below a hard boil.

5. 5Finish in the oven

   Return the chicken and any plate juices to the skillet, spooning sauce over the tops. Transfer the skillet uncovered to the oven for 8 to 12 minutes. Cook until the thickest section reaches 165°F in the center, then remove the skillet and rest the chicken for 5 minutes.

6. 6Wilt and serve

   Move the chicken to a board. Stir spinach, lemon juice, and any resting juices into the hot sauce until the leaves are wilted. Slice the chicken across the grain, return it to the skillet, and spoon the spinach sauce over each portion. Taste before adding more salt.

• Use a 12-inch ovenproof skillet so the chicken has room to brown instead of steaming. If your pan is smaller, brown in two batches and build the sauce after all pieces are removed.
• Watch the sauce at the Parmesan stage. Gentle heat and steady stirring produce a smoother finish; a rapid boil can tighten the dairy and leave the sauce less cohesive.
• Check temperature in the thickest breast, not at the tapered end. Pull the skillet once the center reaches 165°F, then let the chicken rest while the spinach wilts.
• If the sauce becomes thicker than you want after resting, loosen it with a tablespoon or two of warm broth. Add liquid gradually so the flavor remains concentrated.

Spoon the spinach and sauce onto warm plates first, then lay sliced chicken over the top so each piece catches the cream sauce. Roasted cauliflower florets fit naturally beside it and can cook while the chicken is in the oven. For a cooler contrast, pair the skillet with cucumbers, radishes, olive oil, and lemon. If you need a more substantial dinner, add mashed cauliflower or a simple green salad with avocado.