Richie Incognito -- The Loneliest Breakfast ... in Bev Hills

Fresh off his "I'm not a bully" interview, Richie Incognito sat by himself for a lonely breakfast in Beverly Hills this morning ... and TMZ Sports has the photo.

Incognito took a solo seat at The Farm of Beverly Hills ... and ordered a chicken, goat cheese and spinach scramble ... with a cup of coffee to wash it down.

Restaurant sources tell us Richie was pretty quiet during the meal -- but was very polite to staffers and left a pretty solid tip.

Incognito flew in to L.A. on Friday for a sit-down with Jay Glazer -- and claimed he was "best friends" with Jonathan Martin ... and that they frequently joked with each other using vulgar language.