Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Slice the zucchini into 1/2-inch thick rounds and place them in a bowl.
Toss the zucchini with half of the olive oil, half of the sea salt, half of the black pepper, and all of the dried oregano.
Spread the zucchini in a single layer on the baking sheet and roast for 18-20 minutes until tender and slightly caramelized.
While the zucchini is roasting, season the chicken breast on both sides with the remaining sea salt and black pepper.
Heat the remaining olive oil in a medium skillet over medium-high heat.
Place the chicken in the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F.
Add the minced garlic to the pan during the last 60 seconds of cooking, stirring constantly to avoid burning.
Remove the skillet from the heat and drizzle the lemon juice over the chicken to deglaze the pan slightly.
Plate the chicken alongside the roasted zucchini and pour any remaining pan juices over the top.