Whole-Grain Penne with Tuna | Savory

Ingredients

• 1 (13.2 oz) box whole-grain penne
• 1 tbsp olive oil
• 1 small red onion, finely chopped
• 1 yellow bell pepper, seeded and chopped
• 1 red bell pepper, seeded and chopped
• 1 (14.5 oz) can diced tomatoes
• 1 (5 oz) canned tuna in vegetable oil, drained
• 1/2 (8 oz) bag washed spinach
• 1 tbsp fresh oregano, chopped