Quinoa Seafood Paella

1 tbsp extra virgin olive oil1 onion (finely chopped)1 red bell pepper (thinly sliced)1 green bell pepper (thinly sliced)4 cloves garlic (minced)1 tbsp tomato paste1 tsp Spanish saffron threads1 cup uncooked quinoa (rinsed)2 cups unsalted chicken broth1 can diced...