Preheat oven to 400 degrees.
Combine the tuna, cream of mushroom soup, peas and cooked spaghetti squash strands and spices in a casserole dish.
Bake at 400 degrees for 20 minutes, or until the casserole is bubbling.
In the meantime, combine the butter and the almond flour in a small bowl and mix well.
Once the casserole has finished cooking, sprinkle the flour mixture on top of the casserole dish.
Put the dish back in the oven, and bake for 10 more minutes, or until the top is golden brown (broil for a minute if needed).