Preheat oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish.
Cook pasta according to package directions. Drain and set aside.
While pasta is cooking, sauté diced onion and celery in a pan with a little olive oil or cooking spray until softened, about 5-7 minutes.
In a large bowl, combine cooked pasta, sautéed onion and celery, drained tuna, frozen peas, frozen corn, Greek yogurt, vegetable broth, Dijon mustard, lemon juice, salt, pepper, and garlic powder. Mix well to combine.
Pour the mixture into the prepared baking dish. Sprinkle with shredded cheddar cheese.
Bake for 20-25 minutes, or until heated through and the cheese is melted and bubbly.
Let stand for a few minutes before serving.
For a creamier casserole, use a little more Greek yogurt or vegetable broth.
Add other vegetables like mushrooms or bell peppers for extra nutrients.
Top with whole wheat breadcrumbs for added texture.
• Main Dish (American)
• Approximately 350-400 calories
• 30 minutes (Easy)
• 50 minutes
• $10-$15
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