Mix 1 tbsp. olive oil, mustard, lemon juice, sage, salt, and pepper together.
Place chicken breast in a bowl and marinate with ingredients from step 1, approx 2 hrs.
In a medium sized saute pan, heat 1 tbsp. olive oil, once it begins to shimmer, add chicken breast.
Cook until each side is golden brown, check internal temp, finish in oven if need be until internal temperature reaches adequate level.
Once chicken is cooked, dice and assemble other bowl ingredients together however you see fit, do you really need directions on how to make your plate? Live your best life and do what you want!