If you're looking for manga similar to Kenkyuutou no Mayonaka Gohan, you might like these titles.
This 4-koma tells the story of Kurihara Nagisa, a high-school girl who loves eating and cooking. Together with her friends Kanako and Chiaki, the three girls bond over recipes and delicious food.
Yamada, Bun is a shy, quite, keep to herself kinda girl but when it comes to cooking she gets really into it and is an awesome cook. She lives alone with a talking stuffed animal named Hokusai but only she can hear him speak. Bun is fine with her life as long as she has her food and Hokusai.
After his sister got hitched, Umeo has been living on his own for the first time. He really wants to make his own meals everyday no matter how busy he is, but it's difficult since he's always stuck at work until the last train. That's when he encounters a new lifestyle where one prepares the whole week's worth of meals in advance!
Youji is a proud western-cuisine chef in his thirties who believes his cooking is top-notch and only cooks for his own sake. Everyday, he is surrounded by a large number of regulars and workers and fellow chefs—why does this keep happening!?