Preheat oven to 350° F. Collect all your ingredients in one place.
In a medium skillet, sauté the onions, garlic, celery, bell peppers and green beans in the olive oil over medium to low heat until the onions are translucent. Allow to cool.
In a medium to large mixing bowl, combine the veggie mix, tuna, mayo, and cheese (and cooked noodles if you want to use them) in a medium mixing bowl. Transfer mixture to a casserole dish or baking dish, and spread out evenly.
Sprinkle the almond meal over the top of the casserole and bake for approximately 20-25 minutes (just enough to get the cheese melted.)
Remove from oven and allow to cool slightly before serving. Add salt and pepper to taste.
Pairs well with a salad or other veggies.
Notes
Please note that the nutrition data below is a ballpark figure. Exact data is not possible.