All pizza toppings are not created equal. In order to keep up with changing tastes, and sometimes just for novelty’s sake, pizza chains around the world are pushing the limits of what goes on top—and inside—of their pies.

1. Brown Sugar Pearl Milk Tea Pizza

For a limited time, 155 Dominos Pizzas in Taiwan will offer a dessert-style pie that capitalizes on the pearl milk tea craze. According to Taiwan News, the Brown Sugar Pearl Milk Tea Pizza “uses soft New York pizza dough and is topped with a generous helping of shredded mozzarella cheese. Mochi balls and brown sugar tapioca pearls are added as the main topping before honey is slathered on top.” The pizza, which costs $6.50 US, “won high praise from focus groups for [its] ‘Q’ (chewy) texture.” The pizzas are only available until November 24, 2019, so pearl milk tea enthusiasts will have to get them before then.

2. Stuffed Cheez-It Pizza

In September 2019, for a limited time, Pizza Hut debuted its Stuffed Cheez-It Pizza, which The Takeout's Aimee Levitt noted looks more like a toasted ravioli than a pizza. Levitt reported that each order included four of the pizzas, each of which was about the size of the palm of her hand. The exterior, she wrote, did taste like Cheez-Its, and the interior like a Pizza Hut pepperoni pizza. "The only true flaw was the crust," she wrote. "The other thing that makes Cheez-Its so compulsively snackable, besides the cheez, is their crunchiness. The contrast between the crust and the cheese is also one of the things that make pizza—and also true toasted ravioli—so great. There was no crunch here. The Stuffed Cheez-It Pizza is too soggy to attain true snack greatness, or to ever rival a well-made toasted ravioli." According to a press release, the mash-up between the two food brands was borne out of the fact that Pizza Hut's biggest customer base—college students—also love Cheez-Its.

3. Bacon Wrapped Deep Dish Pizza

In 2015, Little Caesars introduced the Bacon Wrapped Deep Dish Pizza. The square pie contains more than 3.5 feet of thick-cut crispy bacon wrapped around its crust and is topped with pepperoni and bacon bits.

4. Cheeseburger Crust Pizza

In 2013, Pizza Hut UK introduced the Cheeseburger Crust Pizza, which was topped with lettuce, tomatoes, and special sauce. The pie drew some criticism for being nearly 3000 calories, or about 288 calories per slice.

5. Cone Crust Pizza

In 2012, Pizza Hut Middle East began offering a special cone crust with any of its pizzas. The ends of the pizza could be folded into coned-shape bites, then stuffed with cream cheese or honey mustard chicken.

6. BBQ Chicken and Cream Cheese Pizza

Pizza Hut Philippines introduced the stuffed pan pizza with BBQ chicken and cream cheese baked inside. It was basically a pizza with empanadas as its crust.

7. Doritos Crunchy Crust Pizza

In 2014, Pizza Hut partnered with Doritos to deliver the Doritos Crunchy Crust Pizza for a limited time in Australia. The crust was stuffed with mozzarella cheese, topped with broken Doritos chips, and sprinkled with cheddar cheese.

8. Cranberry and Apple Stuffed Crust Pizza

For a limited time in 2014, Pizza Hut South Korea rolled out the Star Edge Pizza, a star-shaped crust pie stuffed with an odd combination of cranberry or apple and gooey mozzarella cheese. The pizza also came topped with bacon, beef, sausage, calamari, shrimp, broccoli, and more cheese.

9. The Frito Chili Cheese Pizza

Similar to the Doritos Pizza, Papa John’s partnered with Frito-Lay for the Frito Chili Cheese Pizza, which was topped with beef, chili, cheddar and mozzarella cheeses, and Frito corn chips. It was available for a limited time in 2014.

10. Salmon Fish Roe and Cream Cheese Pizza

Pizza Hut in Hong Kong offered a stuffed crust pizza with salmon fish roe (fish eggs) and cream cheese baked inside. The pizza was also topped with scallops, crayfish, shrimp, and clams. It was available for a limited time in 2014.

11. and 12. Marmite-Stuffed Crust Pizza and Vegemite-Stuffed Crust Pizza

In 2014, Pizza Hut New Zealand introduced the Chee-Zee Marmite Stuffed Crust Pizza, which featured cheese baked inside of the crust with marmite, a salty food spread made from yeast extract. Similarly, Pizza Hut Australia introduced the Mitey Stuffed Crust Pizza the following year, which was basically the same thing only with Vegemite (Australia's version of marmite) inside.

13. Chicken Fillet Crown Crust

In 2012, Pizza Hut Middle East introduced the Chicken Fillet Crown Crust Pizza. It featured chicken fillets nestled on top of a crown crust and topped with chicken tenders and drizzled with BBQ sauce.

14. Hot Dog Stuffed Crust Pizza

Pizza Hut offered two versions of the Hot Dog Stuffed Crust Pizza: The first was available in Thailand and the UK in 2012 and featured a continuous hot dog loop baked inside of the pizza’s crust and drizzled with mustard. The Hot Dog Bites Pizza was the second go-around, which was made available to American customers in 2015. It featured hot dog bites wrapped in a regular pizza crust or pretzel and came with a mustard dipping sauce.

15. KFC Chizza

In 2015, KFC India topped a chicken breast with marinara sauce, pepperoni, cheese, peppers, and pineapple and called it the KFC Chizza, which was also introduced at KFC Philippines locations. Who needs a doughy crust when you have chicken as a base?

Bonus: QC Pizza’s Kinda Big Dill

Mahtomedi, Minnesota’s QZ Pizza isn’t a fast food chain, but we couldn't resist including their “Kinda Big Dill” pie on this list. Homemade garlic dill sauce goes on the crust, followed by Canadian bacon, then a layer of pickles. On top of that goes mozzarella cheese, followed by another layer of pickles and a dusting of dill. They also have a Reuben Pizza and a taco pizza, but Big Dill tops them all for originality.