How to make the best Blackened Breast of chicken quick and easy

You don't have to deal with both stove top and oven. Nice and spicy for 1 portion
3 ea. 1.3 oz. chicken cutlet
2 piece romaine leaf
1 Campari tomato
1/2 tsp. Cajun seasoning
3 Kalamata olives or green or black
1/4 c. diced onion
1/2 T. garlic clove
1 tsp. olive oil for onions
1/2 tsp. olive oil for chicken
1 hamburger bun or your favorite roll
salt not necessary, olives are salty and no pepper