preheat your oven

slice the onion and cut the bell pepper into large cubes

slice each chicken breast from the middle to make it thinner

add to the chicken, the lemon, cajun seasoning, salt, blackpepper, onions and bell pepper and mix together

put the chicken into a pan with the onion and the bell peppers

add the butter on top of the chicken breasts

this should take approximately 20 to 25 mins in the oven