-
1
Combine both types of ground beef, onion, sea salt, and black pepper in a large bowl and mix until ingredients are incorporated.
-
2
If using a cast iron skillet/griddle, place the heat on medium-low to medium.
-
3
If using a non-stick pan, place the heat on medium-high.
-
4
Now take 1/4 of the beef mixture and form into a ball and put some of the butter inside.
-
5
Form into a thin patty and set on a plate.
-
6
Continue with remaining beef.
-
7
For every patty, add 1 tablespoon of vegetable oil into your griddle/pan.
-
8
Once oil is heated add patties into the skillet in a single layer and use a spatula to smash the beef down.
-
9
This helps spread it a bit more to create more surface area that crisps up.
-
10
After about 4-5 minutes or until beef is mostly cooked, flip and add 2 slices of cheese per burger.
-
11
Cook for about 2-3 more minutes to sear the opposite side and melt cheese.
-
12
You can cover burgers with a lid to help melt cheese faster.
-
13
Add buns to the griddle/pan (inside part down) at the end for about 10-20 seconds to warm up and slightly char the bread.
-
14
Remove patties and buns from griddle/pan and put some mayonnaise on the bottom buns before putting patties on top.
-
15
Add whatever toppings you like (I used caramelized onions, sometimes chopped raw onions, jalapenos, ketchup, and mustard).
