Low carb / keto pesto chicken casserole
In either an oven tray or oven proof frying pan, heat the oil then fry the onion for a couple of minutes until translucent, then add the garlic
If you only have raw chicken, chop into even sized pieces, then fry, turning over until cooked through.
Add the pepper, or whatever other veg you're using to cook through/soften, then the cooked chicken pieces to warm through.
Wilt the spinach
Stir in the cream cheese and pesto to coat everything. You might want to thin the cream cheese first by mixing in a small amount of milk (or a little double cream or chicken stock if sticking to low carb) before adding it.
Season with ground black pepper to taste. Add the cherry tomatoes and the grated cheese over the top.
Bake in preheated oven (180C) until hot, and the cheese is melted and bubbling
Serve as it is (or if not low carb with crusty bread).