Baltimore Ravens starting OL Bradley Bozeman ate 4.5 POUNDS of steak -- PLUS FIXINGS -- at dinner Wednesday night ... and the dude hardly broke a sweat!!!

The epic meal went down in Amarillo, Texas at "The Big Texan Steak Ranch" ... where Lamar Jackson's personal protector decided to take on the restaurant's famous food challenge.

Here's the deal ... ya gotta kill a 72-ounce steak, a shrimp cocktail, a baked potato, a salad and a roll with butter in under 1 hour -- and winners get a FREE T-SHIRT (plus, the meal is free and you get your name on the wall).

Bozeman -- a 6'5", 317-pound NFL stud -- happily accepted the challenge ... and you can see in video of him chowing down, he CRUSHED it!!!

The 25-year-old finished every last bite, with more than 10 minutes to spare ... and afterward, he didn't look any worse for wear at all!!

Of course, when we spoke with Bozeman hours after the meal ... he wasn't feelin' all that hot about it, telling us, "That was definitely the hardest thing I've ever had to eat."

By the way, the reason Bozeman was in the North Texas town was pretty cool ... he and his wife, Nikki, had just finished a successful stop on their country-wide tour of schools to speak to kids about the dangers of bullying.

Up next for the Bozemans is a speaking engagement at a school in Albuquerque, N.M. ... but Bozeman says there's absolutely NO CHANCE he has another steak there.