We all get in food ruts sometimes. It's easy to get stuck thinking one food just goes with another, and that's all there is to it. Right now I'm going through a weird grilled cheese phase where I have to have one as a "side-dish" with my dinner every day. Just when you think it will never end a fast food mashup will come along and change that way of thinking. There are countless combinations to be had. Here are seven of the most delicious fast food mashups ever created that we wish we had thought of first. 1. Burger King Whopperito The Whopperito was, you guessed it, a Whopper in burrito form. Burger King used typical Whopper toppings like lettuce, onion, and pickles, but added queso to give it more of a burrito taste. The Whopperito may have been short-lived, but some fans are still holding out hope for its return. [[instagramwidget||https://www.instagram.com/p/BLPQ_z7g14Q/?tagged=whopperito]] 2. Denny's Mozzarella Stick Grilled Cheese The only thing that can make cheese better is adding more cheese to it. It was in that spirit that Denny's created the Fried Cheese Melt, which is a grilled cheese with fried mozzarella sticks in it. The item was discontinued, but whip up a grilled cheese and mozzarella sticks, and it should be pretty easy to create your own. 3. KFC Double Down In 2010, you couldn't miss the buzz about the KFC Double Down. It was an absurd sandwich that used two pieces of fried chicken as a bun, with bacon, cheese, and sauce sandwiched between them. Calling it unhealthy is an understatement, but it was incredible. They even released a hot dog-version of the infamous sandwich. 4. Pizza Hut's Hot Dog Stuffed Crust  Do you ever find yourself struggling to decide between a hot dog and a pizza? Well, in 2015, Pizza Hut tried to solve that problem for you. The Hot Dog Stuffed Crust Pizza was a regular pizza for the most part, with a hot dog stuffed into a pretzel bun as the crust. It even came with mustard to dip your crust in. [[instagramwidget||https://www.instagram.com/p/4vCZX6GZK_/?tagged=hotdogstuffedcrust]]  5. Dunkin Donuts' donut sandwich Doughnut buns have gotten easier to come by in recent years. But in 2013, Dunkin Donuts was way ahead of the game, adding a donut sandwich to their menu. It featured bacon and egg pressed between two donuts. 6. Hardee's Most American Thickburger The "Most American Thickburger" combines some of the most American foods there are - a cheeseburger, a hot dog, and potato chips. Add a side of apple pie, and you'd have the most American meal in the world. Although it may not be a good choice from a health perspective, it was certainly a delicious mashup. 7. McDonald's McLand, Air, and Sea Sandwich This secret menu item at McDonald's combines a Filet-O-Fish, a chicken patty, and a McDouble or a Big Mac into one monstrosity of a sandwich. Now, for the name to really work, you have to pretend that a chicken is actually a bird of flight. But who are we to judge? Secret menu or not, I'm pretty damn hungry after reading this list. I'll see you at the drive-thru.

7 Of the greatest food combinations in fast food history

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