My 14mo's usual food diary:
Breakfast: toast, sometimes with jam/ PB but usually plain. Or a hot cross bun or a pancake. Usually goes mostly untouched (jam or butter gets kicked off though) few squares of cheese. Some Greek yoghurt and fruit. Sometimes eggs. < not all at once and usually just a few bites of each.
Lunch: hot meal at nursery twice a week. When she's at home, I usually do picky bits - such as pitta, hummus, cucumber/ tomato, cheese, roast chicken, grapes etc. Basically anything suitable in the fridge 
Dinner: mostly homemade, because I love cooking. Pasta, roasts, currys etc. Although her favourite is mashed potato, baked beans, chicken and cheese all mashed together
often I just do scrambled eggs or even chicken dinosaurs or whatever if I cba or she's being clingy. I don't think it's the end of the world.
A few times a week, she'll have some carrot puffs/ sweetcorn rings or whatever overpriced pseudo toddler crisps I pick up with her lunch. She always gets buttons when grandads around, and if we have a treat, we give her a bit too. Like on Father's Day, she had a few profiteroles. She went to McDonald's for the first time the other day and had some nuggets and a fruit bag.She always has a taste of our desserts if we go out to eat, and while we were on holiday she had ice cream every day multiple times. On her birthday, I let her tear into her £45 cake and fill her boots 
She's a great eater though, and will often choose veg over less healthy options. She's a perfect weight (75th percentile forever) and I've always been really chilled about it, so maybe that's why she is too. I think if you restrict these things too much, that's when kids get fixations over 'forbidden' foods.
But I get that I'm the parent of a one year old so all this may change, and I might end up eating my own words. ATM I just think there's bigger things to worry about than your kid having a few buttons every now and then 