Place a medium sized pan on the stove over medium-high heat and add the olive oil.
Coat both sides of the chicken breast with the dried basil, salt and pepper and place in the pan. It should take about 3-4 minutes per side for the chicken to develop a nice golden brown colour.
Once both sides are done, remove the chicken from the pan, place on a plate and set aside
Lower the heat to medium-low and add the garlic and diced onion. Sprinkle with a pinch of salt and place a lid on the pan
After 2 minutes add the two cups of cherry tomatoes and chopped mushrooms, place lid back on and let cook for 15 minutes, stirring occasionally (if it looks to be burning, lower the heat)
Add the chicken breasts back to the pan with the sauce and let cook for another few minutes with the lid off so the sauce can reduce