The patty is part of a burger build featuring tomatoes and onions, lettuce, pickles, American cheese and All-American sauce on a multigrain bun. The sauce and cheese are not suitable for vegans.
Denny's says the launch meets its 'guests' desire to move toward a flexitarian diet'.
"We were thrilled to be able to answer the call from our guests to add more plant-based protein options to our menu when we launched the Beyond Burger in Los Angeles at the end of last year," John Dillon, chief brand officer for Denny's, said in a statement.
"The positive response we received validated our decision to partner with Beyond Meat to introduce our guests to a plant-based option.
"We could not be more excited to add the Beyond Burger to our permanent lineup of delicious, affordable menu options as we continue to innovate and expand our menu to meet evolving dietary preferences."
'A big step'
"Partnering with Denny's has been a big step in increasing offerings for those looking to introduce plant-based protein into their diets or for alternative choices at their favorite restaurants," added Tim Smith, Beyond Meat's VP of North America Sales, Foodservice.
"We're delighted to expand our partnership with the iconic diner and provide another option that offers the taste you know and love with a burger but has the nutritional and environmental benefits of plant-based protein."