Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Slice the bell pepper into thin strips, toss with 0.5 tbsp of olive oil, and roast for 15 minutes until tender and slightly charred.
Season the chicken breast evenly with sea salt, black pepper, and garlic powder.
Heat 0.5 tbsp of olive oil in a skillet over medium-high heat and sear the chicken for 6-7 minutes per side until golden and cooked through.
In a large serving bowl, combine the chopped romaine lettuce, baby spinach, and cooked quinoa.
Whisk the remaining 0.5 tbsp of olive oil and lemon juice together in a small jar to create the vinaigrette.
Dice the tomato and slice the cooked chicken into bite-sized strips.
Arrange the chicken, roasted peppers, edamame, tomato, and avocado slices over the greens, then drizzle with the lemon vinaigrette.