Pat the chicken breast dry with a paper towel and cut into 1-inch bite-sized cubes.
Season the chicken cubes evenly with half of the sea salt, black pepper, and dried oregano.
Prepare the vegetables by slicing the zucchini into half-moons and chopping the red bell pepper into 1-inch pieces.
Heat the extra virgin olive oil in a large stainless steel or cast iron skillet over medium-high heat.
Add the chicken to the hot skillet in a single layer and sear for 5-6 minutes, turning occasionally, until golden brown and cooked through.
Remove the charred chicken from the skillet and set it aside on a clean plate.
In the same skillet, add the zucchini and bell peppers, sautéing for 4-5 minutes until they are tender-crisp and slightly browned.
Stir in the minced garlic and halved cherry tomatoes, cooking for an additional 2 minutes until the tomatoes just begin to soften and burst.
Return the cooked chicken to the skillet, drizzle with lemon juice, and sprinkle with the remaining seasonings.
Toss everything together for 1 minute to allow the flavors to meld, then serve immediately.