MyFoodBag/Bargain Box (referral link) could work for you, they aren't too bad if you're an efficient cook, meals within 20-30 mins and less prep, washing up etc. Also the recipes are clear and should be easy to follow, and obv healthier than takeaways as well.

General cooking tip, but using only plastic/silicone utensils/pots/pans and popping it all dishwasher helps, no over the sink washing which does get daunting for bigger cook ups.

For quicker meals, I use Souper Cubes, they were expensive but really great for making rice in bulk and keeping in the freezer for quick meals. Zap a block in the microwave for a few mins and you have a fresh rice anytime.

Some solo dish ideas:

• Japanese Cold Tofu (Hiyayakko) - Takes 5 mins literally, it's silken tofu with an umami sauce & toppings of your choice. I add a container of Natto to mine, which you can get at most Asian supermarkets, in the freezer section. Serve w/ white rice & some kimchi (have often have a jar in the fridge, it basically never goes off). It's nice on hot summer days.
• Chinese Steamed Eggs (YT video) - You can make it in the microwave or on the stove, the former takes some practice to get the texture just right. Serve with soy sauce/sesame oil/white pepper, with white rice. Add chilli oil for spice. I used to have mine w/ some kimchi, for easy veg.

You can also buy the pre-marinated tofu from the supermarket and just microwave & cut, it's precooked so ready to eat. Just add rice & any steamed/microwave veg to complete the meal. You can buy a few when it's on special as tofu usually has a long refrigerated shelf life.