I'm a former meat-eater who's always been skeptical of plant-based 'meat.' But after trying meatless burgers from 3 fast-food chains, I've completely changed my mind.

First, I went to a White Castle in Brooklyn, New York, to try the Impossible slider.

The slider was only $1.99, and it came in this cute little box.

This slider may be small, but it packs a lot of flavors. It comes with smoked cheese, caramelized onions, and a pickle slice ...

Source: White Castle

... and, of course, the Impossible patty, which is made from soy protein, potato protein, coconut oil, and sunflower oil.

Source: White Castle

One bite in and one word came to mind — steak. This slider smells and tastes exactly like a meaty steak.

And believe it or not, that's because of the sunflower oil. The sunflower oil has heme in it, which is a molecule that contains iron and gives this slider a meaty flavor.

Plus, the caramelized onions, smoked cheddar, pickle, and warm toasty bun complimented the patty well.

Source: White Castle

Next, I hit the Carl's Jr in Brooklyn, New York, to try their Beyond Famous Star cheeseburger.

Carl's Jr's Beyond Famous Star with cheese was $7.49, quite a bit more than White Castle's slider.

But this burger was also much bigger and worth every penny.

It came with all the standard burger fixings: lettuce, tomato, onion, ketchup, and mayonnaise.

The patty is made mostly of pea protein, rice protein, mung bean protein, and beet juice extract for that meaty color.

Source: Carl's Jr.

One bite in and it was clear that this burger did not taste nearly as meaty as White Castle's Impossible slider ...

... but I liked it better. While the meat flavor wasn't as strong, the texture was more like a beef burger. It was juicy and buttery and felt fresh off the grill, which gave it an edge over the slider.

Lastly, I went to Burger King in downtown Manhattan, New York, to try the Impossible Whopper.

The Impossible Whopper was $7.29, a comparable price to Carl's Jr.'s burger.

And it was easily the biggest of the three burgers.

Inside the sesame buns, the burger held lettuce, tomato, onions, ketchup, and mayonnaise.

Like the Impossible slider at White Castle, the Impossible Whopper is made up of mostly soy protein, potato protein, coconut oil, sunflower oil, and heme.

Source: Impossible Foods

There was no doubt that the Impossible Whopper looked the best.

It looked more like a beef burger than any of its counterparts, and the bun kept the ingredients from spilling out.

But after taking a bite, I was underwhelmed.

While the Impossible slider tasted more like meat, and the Beyond Famous Star felt more like meat ...

... the Impossible Whopper neither tasted nor felt particularly meaty, landing it in last place.

But ultimately, I was impressed by how much all three burgers resembled beef. Each one was enjoyable, and as a non-meat eater who was once skeptical of plant-based burgers, I would definitely eat any of these burgers again.