Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Rinse the quinoa under cold water and combine with 0.5 cup of water in a small saucepan; bring to a boil, then reduce heat, cover, and simmer for 15 minutes.
Place the broccoli florets and sliced bell peppers on the baking sheet, toss with 0.5 tbsp of olive oil, sea salt, and black pepper, then roast for 15-20 minutes until tender.
While vegetables roast, heat the remaining 0.25 tbsp of olive oil in a skillet over medium-high heat and add minced garlic, sautéing until fragrant.
Add the shrimp and dried oregano to the skillet, cooking for 2-3 minutes per side until the shrimp are pink and opaque.
Fluff the cooked quinoa with a fork and divide it into serving bowls.
Top the quinoa with the roasted vegetables and garlic shrimp, then finish with a drizzle of fresh lemon juice.