Preheat your oven to 425°F (220°C).
In a bowl, toss the sliced peppers, zucchini, cherry tomatoes, and red onion with the olive oil. Season with salt and pepper.
Spread the vegetables on a baking tray and roast for 25-30 minutes or until they are tender and slightly caramelized.
While the vegetables are roasting, rinse the quinoa under cold water.
In a medium saucepan, bring 2 cups of water to a boil. Add the quinoa, reduce the heat to low, cover, and simmer for about 15 minutes or until the quinoa is cooked and the water is absorbed.
Transfer the cooked quinoa to a large mixing bowl.
Once the vegetables are roasted, add them to the quinoa.
Mix in the chopped almonds, lemon juice, and fresh basil. Stir everything well to combine.
Taste and adjust the seasoning if needed.