Slice each chicken breast in half horizontally to create thinner cutlets, then gently pound them to an even thickness with a mallet. This step keeps the chicken from drying out and helps it cook quickly and evenly in the pan.
In a shallow dish, mix the flour, garlic powder, salt, and pepper. Press each chicken cutlet into the mixture, coating both sides lightly and shaking off any excess before setting it aside.
Heat the olive oil in a large skillet over medium-high heat. Add the chicken in a single layer and cook for 3 to 4 minutes per side, until golden brown and just cooked through, then transfer it to a plate.
In the same skillet, melt the butter and add the minced garlic, stirring for about 30 seconds until fragrant. Pour in the chicken stock, lemon juice, honey, and chili flakes, then add the lemon slices and let everything simmer for a couple of minutes.
Return the chicken to the pan, spooning the sauce over each piece so it gets fully coated. Let it simmer gently for another minute or two until the sauce thickens slightly and clings to the chicken.
Sprinkle the finished dish with freshly chopped parsley right before taking it to the table. The bright green flecks against that sticky amber glaze make it look every bit as good as it tastes.