Preheat the oven to 350°F (175°C).
Cut off the upper sides of bell peppers and remove the seeds and membranes.
First, using a fine-mesh strainer, thoroughly wash the quinoa, and then add it to water in a saucepan.
Olive oil should be heated in a big saucepan while the quinoa is cooking.
After absorbing the water, simmer the mixture for 15 to 20 minutes.
After two to three minutes of cooking the garlic and onion, the onion should be transparent.
For around three minutes, let tomatoes and spinach boil in a pot.
Stir the cooked quinoa into the pot with the veggies after adding it. After removing it from the fire, pine nuts, fresh basil, salt, and pepper should be added.
Fill the bell peppers with the quinoa mixture, then stand them up in a baking dish.
If you want soft peppers with a browned top, bake them at 400 degrees for 30-35 minutes.