Gather all ingredients and prepare them while your skillet heats. Thinly slice the red onion, chop the sun-dried tomatoes, mince the garlic, halve the kalamata olives, and grate the parmesan cheese fresh—this makes a noticeably smoother sauce compared to pre-grated. Pat the chicken thighs dry with paper towels, then season both sides generously with salt and pepper. Dry chicken is crucial for achieving a proper golden crust.

Heat 3 tablespoons of olive oil in a large skillet over medium-high heat until shimmering. Working in batches if needed to avoid crowding, sear the chicken thighs skin-side down for 5-6 minutes until the skin is deeply golden and crispy, then flip and cook the other side for another 5-6 minutes. Transfer the seared chicken to a plate—it doesn't need to be fully cooked through yet, as it will finish in the sauce.

Reduce heat to medium-low and add the 2 tablespoons of butter to the same skillet. Once melted, add the sliced red onion and sun-dried tomatoes, stirring occasionally for 3-4 minutes until the onion softens and the flavors begin to meld. Add the minced garlic and red pepper flakes, stirring constantly for about 30 seconds until fragrant. I like using Kerrygold unsalted butter here because its rich, creamy texture creates a more luxurious sauce foundation.

Pour in the 3/4 cup of chicken broth (ideally reduced by half beforehand for deeper, more concentrated flavor) and the 1/2 cup of cream, stirring to combine all the browned bits from the pan. Add the oregano and let the mixture simmer gently for 2 minutes. This gentle simmer allows the flavors to blend without breaking the cream or making the sauce grainy.

Reduce the heat to low and stir in the freshly grated parmesan cheese from Step 1, stirring continuously until the cheese is fully melted and the sauce becomes smooth and silky—about 1-2 minutes. Nestle the seared chicken thighs back into the sauce skin-side up, then scatter the halved kalamata olives around and over the chicken.

Cover the skillet and simmer over low heat for 10 minutes until the chicken reaches an internal temperature of 165°F when checked with a meat thermometer in the thickest part of a thigh. The gentle braising in the creamy sauce ensures the chicken stays moist and tender while the flavors fully develop. Serve immediately while the sauce is still warm and creamy.