Heat a non-stick skillet or frying pan over medium heat.
While the pan is heating, prepare your keto bread by toasting it in a toaster or on a separate dry skillet until lightly golden and crisp.
In the same pan, cook the breakfast sausage patties according to the package instructions until they are browned and fully cooked. Remove the sausages from the pan and set them aside.
Reduce the heat to low, and in the same skillet, melt half of the butter or ghee.
Crack the eggs into the pan, one at a time, and cook them to your preference (fried, scrambled, or sunny-side-up). Season the eggs with salt and pepper to taste.
Once the eggs are cooked, assemble the sandwich. Place one slice of keto bread on a plate and top it with one cooked egg, followed by a sausage patty, and a slice of cheddar cheese.
Add any optional toppings you desire, such as avocado slices or spinach.
Place the second slice of keto bread on top to complete the sandwich.
Optionally, you can warm the sandwich in the skillet for a few seconds to slightly melt the cheese and bring all the flavors together.
Serve your delicious Keto Egg and Sausage Breakfast Sandwich immediately and enjoy your low-carb, high-fat meal!