Imagine going to the grocery store for dinner, not to pick up a rotisserie chicken to take home, but to actually eat at the store. As online grocery shopping grows, many supermarkets are adding sit-down restaurants in a move to attract more millennials. And it seems to be working.

Kyle Riggs, who manages Market Grille, the restaurant at a Hy-Vee grocery store in Columbia, Mo., says most people don’t expect to find this level of food service next to the produce aisle.

“And then when they walk in here, they’re just amazed at the full wine wall with the ladder that slides,” he says. “We have 20 beers on tap and a lot of high-end alcohol, whiskeys and things like that, and great food.”

Kyle Riggs

The ingredients come from the store. They are cooked in the store’s kitchen and served here. Riggs says football games can pack the 148-seat restaurant with college students and young professionals.

Indeed, Rob Hunt, 30, and Aaron Hadlow, 28, have been stopping by all summer for happy hour after work. Hunt says the variety of food, the local, craft beer on tap and ultimately the price are a big draw.

“You can’t get $2 pints of beer anywhere else and that’s honestly the biggest thing,” he says. “We tried a couple of other places this summer and they were fun, but it’s just cheaper over here.”

Across the country, supermarkets like Whole Foods have been offering sit-down dining and drink deals for years. The trend of adding full restaurants, sometimes called “groceraunts,” falls in line with the uptick in prepared store meals, which has grown 30 percent since 2008 and driven $10 billion in sales last year, according to the NPD group.

Hy-Vee, which was one of the early adopters of the groceraunt model, has added 115 Market Grilles to date.

While grocery stores had been losing customers in recent years to smaller…