Remove from heat and then add the zucchini/courgette, stirring to combine. Place the entire mixture into the casserole dish.
In a separate bowl, combine the remaining 1 TBSP of broth, the almond flour, basil, remaining oregano, garlic, and onion powder. Stir until it resembles a crumbly dough, if you need a bit more broth, add 1 TBSP at a time.
Crumble the dough with your hands over the top of the casserole like a breadcrumb topping and then cover with foil.
Cook in oven for about 20 minutes and then remove the foil and cook for another 5-10 minutes or until the topping is golden brown.
Remove from oven and enjoy!
Recipe by barre.eat.repeat at https://barreeatrepeat.com/2018/11/23/superpower-whole30-tuna-zoodle-casserole/