Pat chicken breasts dry with paper towels and season evenly with salt, pepper, and dried oregano.
Heat 1 tablespoon of olive oil in a large non-stick skillet over medium-high heat.
Add chicken to the skillet and sear for 6 to 7 minutes per side until the internal temperature reaches 165 degrees Fahrenheit.
Remove chicken from the pan and let it rest on a cutting board for 5 minutes.
In the same skillet, add the remaining tablespoon of olive oil and the broccoli, bell pepper, and zucchini.
Sauté the vegetables for 5 to 8 minutes, stirring occasionally, until they reach a tender-crisp texture.
Stir in the minced garlic and cook for an additional 60 seconds until fragrant.
Slice the chicken into strips and serve alongside the sautéed vegetables, finishing with a drizzle of lemon juice.