1. 1. Prepare the Chicken and Leeks: Start by heating the olive oil in a large oven-safe skillet or Dutch oven over medium-high heat. Add the cubed chicken and cook, stirring occasionally, until it’s lightly browned on all sides, about 5-7 minutes. You don’t need to cook it all the way through at this stage. Remove the chicken from the skillet and set it aside.

2. 2. Saute the Aromatics: In the same skillet, add the thinly sliced leeks. Cook them over medium heat, stirring frequently, until they soften and become translucent, which usually takes about 5-7 minutes. Add the minced garlic and cook for another minute until fragrant, being careful not to burn the garlic.

3. 3. Create the Creamy Sauce: Sprinkle the flour over the softened leeks and garlic. Stir well for about 1 minute, allowing the flour to cook slightly and form a roux. Gradually pour in the chicken broth, stirring constantly to prevent lumps, until the mixture thickens. Stir in the heavy cream, dried thyme, salt, and black pepper. Bring the sauce to a gentle simmer, then reduce the heat to low.

4. 4. Combine and Simmer: Return the browned chicken to the skillet with the creamy leek sauce. Stir everything together to ensure the chicken is well coated. Let the mixture simmer gently for 5 minutes, allowing the flavors to meld and the chicken to finish cooking through.

5. 5. Top with Crescent Rolls: Preheat your oven to 375 F (190 C). Carefully unroll the crescent roll dough and arrange the triangles over the top of the chicken and leek mixture in the skillet. You can overlap them slightly, creating a beautiful, golden crust.

6. 6. Bake to Golden Perfection: Transfer the skillet to the preheated oven and bake for 15-20 minutes, or until the crescent rolls are puffed up, golden brown, and cooked through, and the filling is bubbly. Keep an eye on the crust to prevent over-browning.

7. 7. Rest and Serve: Once baked, carefully remove the skillet from the oven. Let the chicken and leek bake rest for 5-10 minutes before serving. This allows the sauce to set slightly and prevents you from burning your mouth.