Depends how low carb you are going I suppose, but if you are allowing some carbs eg veg etc....
I don’t often eat breakfast but when I do it’s usually a shake so I do almond milk, full fat live yoghurt or kefir, blueberries/raspberries, avocado or peanut butter in my bullet blender.
I do a big tray of roasted Mediterranean veg, olive oil, peppers, Anchovies, mushrooms, sundried toms etc on a Sunday night- slow cook it and then put a scoop on a salad, with some feta cheese. That will do me for a few lunches
Really nice salads with lettuce, tom, cucumber, edamame peas, peppers, and some protein in the form of eggs, ham, cheese etc and some fat (olive oil, avocado)
I made a delicious frittata this weekend with smoked haddock, eggs, asparagus and cream; it sliced really well once cooled and would have been great to have as lunches but I ate it all!!
For evening meals, the internet is literally awash with recipes. Look up Keto, paleo, high fat/low carb etc on Pinterest and there’s so many to choose from. Tonight I’m doing frozen fish fillets with red pesto, and puréed peas.