Preheat your oven to 400°F. Peel and cube the sweet potato, then toss with a small drizzle of oil and roast on a parchment-lined sheet for 20 minutes until tender.
Season the chicken breast evenly on both sides with the sea salt, black pepper, and dried oregano.
Heat the olive oil in a large stainless steel or cast iron skillet over medium-high heat.
Place the chicken in the skillet and sear for 6 to 7 minutes per side until the exterior is golden brown and the internal temperature reaches 165°F.
Remove the chicken from the pan and let it rest on a cutting board. In the same skillet, add the minced garlic, sliced zucchini, and halved cherry tomatoes.
Sauté the vegetables for 4 to 5 minutes until the zucchini is tender-crisp and the tomatoes begin to burst.
Pour the lemon juice into the pan to deglaze, scraping up any flavorful browned bits from the chicken.
Slice the chicken and serve it alongside the roasted sweet potatoes and the sautéed zesty vegetables.