Pat the chicken breast dry with a paper towel and season both sides evenly with sea salt and black pepper.
Heat the extra virgin olive oil in a medium stainless steel or cast-iron skillet over medium-high heat until shimmering.
Place the chicken in the skillet and sear for 5-6 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
Remove the chicken from the pan and set it aside on a plate to rest.
In the same skillet, add the whole cherry tomatoes and smashed garlic cloves, tossing them in the residual juices and oil.
Cook the tomatoes for 3-4 minutes, stirring occasionally, until the skins begin to blister and burst.
Pour in the balsamic vinegar to deglaze the pan, scraping up any browned bits from the bottom with a wooden spoon.
Stir in the fresh basil leaves until just wilted and remove the pan from the heat.
Slice the chicken and serve it over the warm cooked quinoa, topping it generously with the burst tomatoes and balsamic pan sauce.