Lunchables
Grocery shopping was always a huge debate at Avengers Tower. It needed to be done quite often, seeing as they needed to feed nine people every day.
Pepper had sent her assistants to do it in the past, but now as CEO she had too much on her plate.
Tony was too irresponsible to remember to feed himself regularly without someone telling him, let alone remember to shop.
Clint had tried, but he'd lost the grocery list and improvised, and they'd eaten frozen pizza and mac-and-cheese for a week.
Thor was slightly confused by the process, and Bruce got road rage from the crowded aisles, which wasn't good news with the Hulk (they'd found that out the hard way).
Wanda sometimes went, but she was still a kid and got nervous when people recognized her and stared.
Pietro always got distracted and flirted with every young woman in the store, often forgetting all the things on the list. Once, they had to go get milk at seven a.m. because he'd forgot to get it.
So that left Natasha. She didn't mind the shopping; it gave her a chance to buy whatever she wanted on a whim, or restock her secret chocolate stash without Clint's knowledge. If he knew, it'd be gone in a day.
Natasha pushed the cart down the aisle, double-checking that she'd gotten all the items on the list. It was a full sheet of paper, filled with multiple types of handwriting. Clint's chicken scratch, asking for chips. Steve's neat cursive, requesting apples, his favorite fruit. Pepper's proper writing, telling them they're out of corn flakes. Pietro's hasty abbreviated scrawl, asking for Lucky Charms and Skittles. Natasha smiled at Wanda's comment that said Pietro didn't need the candy, he'd get really hyper. As she walked past some Lunchables, she paused and put a few in the cart. Yes, she was a grown woman who happened to also be an assassin. And yes, she enjoyed eating Lunchables.
When she arrived at the checkout, the cashier chuckled quietly as he scanned the Lucky Charms and Lunchables. Natasha's steely gaze and raised eyebrow stopped him. The man seemed to know that she wasn't someone to mess with.