Cover a brick in aluminum foil. Spray lightly with non-stick cooking spray. See the tips for other things you can use.
Split the 1/2 pound of sausage meat in two and form two large meatballs.
Place the meat on a cutting board and gently "smash" with the brick. Keep tapping gently until the burger is very thing - about 1/8 at most.
Use a spatula to gently lift the burgers and set them aside.
Cut the onion into very thin slices.
Sprinkle the onions with hot sauce to taste. Always start light and add more.
I used two frying pans for the next steps. If you only have one, start by cooking the onions and then move on to the sausage.
Melt one tablespoon of butter in a frying pan over medium high heat. Add the onions and cook until soft and translucent, about 5 minutes.
While the onions cook, add 1/2 to 1 tablespoon of olive oil to the frying pan. Sausage meat has quite a bit of fat, so you don't need to overdo the oil. Start light and add more if the burger stick.
Cook the burgers about three minutes on each side until completely browned and crispy. They are quite thin, so the inside will cook rather quickly.
Set aside the cooked onions and the cooked sausage.
I cooked two separate omelets, but you can cook one larger one and cut it in half. The choice is yours.
Crack two eggs (for one omelet) into a bowl and mix until lightly frothy.
Add 1 tbsp of butter to the frying pan ( I used the one that had the onions) and add the eggs. Lightly sprinkle with salt and pepper.
Cook the omelet over medium high heat until it is mostly firm (about four minutes). Flip the omelet and lower the heat.
Place two slices of cheddar on top and cook gently until melted. I usually put a lid on the frying pan, leaving one side open, to encourage the cheese to melt.
Toast an English muffin while the cheese melts.
Make your second omelet and toast the second muffin.
Put your sandwich together: muffin on bottom, omelet and cheese, sausage smashburger, onions, muffin top.
Serve with ketchup or more hot sauce - or both!