Our teenagers will fill up with snacks and then not want "proper" food at mealtimes.
Saying this sometimes I am happy to give them "snack foods".
So our local food hall does amazing pork pies (think chunky proper meat full) so I get those and they share. Houmous with oatcakes. Bread sticks. Feta cheese and Italian ham for sandwiches.
They will eat hard boiled eggs all day if left, so I boil a limited number.
Nuts.
I tend to buy more ready made on the sweet side because making dessert never seems time. So popcorn goes down well, Tony's chocolate bars (milk crispy is a favourite), if I am feeling nice jam donuts. And at the moment because you can't get them all year mini eggs.
Again if I am feeling generous nice butter shortbread.
Peanut butter on toast is handy
Crumpets/bagels with cream cheese, butter, honey.
Scones with jam and clotted cream.
Chop up a fruit salad with yogurt
Once I slice a melon, watermelon seems favourite that usually disappears.