In a shallow dish, combine the all-purpose flour and lemon pepper seasoning and mix until evenly blended.
Pat the chicken slices lightly with a paper towel if wet, then dredge them in the seasoned flour to coat evenly.
Heat a large skillet over medium heat and melt the 2 tablespoons of butter.
Add the coated chicken slices to the skillet in a single layer (work in batches if needed) and cook until golden and cooked through, about 3–4 minutes per side.
Continue cooking remaining chicken, adding more butter if necessary, then remove from the skillet and serve.