In a small mixing bowl, combine the ground turkey with sea salt, black pepper, garlic powder, and dried sage until well incorporated.
Form the seasoned turkey into a wide, flat patty slightly larger than the diameter of your English muffin to account for slight shrinkage during cooking.
Heat a non-stick skillet over medium heat and add half of the ghee. Once melted, add the turkey patty and cook for 4-5 minutes per side until browned and cooked through.
While the turkey is cooking, whisk the whole egg and liquid egg whites together in a small bowl until smooth.
Remove the turkey patty from the skillet and set aside. Wipe the pan clean if necessary, add the remaining ghee, and pour in the egg mixture.
Use a round silicone egg mold or gently fold the edges of the eggs as they cook to create a circular patty that fits the muffin. Cook until the eggs are fully set.
Split the whole wheat English muffin and toast until golden and crisp.
Assemble the sandwich by placing the turkey sausage patty on the bottom half of the muffin, followed by the egg patty and the slice of sharp cheddar cheese.
Place the top half of the muffin on the cheese and let it rest for 30 seconds to allow the residual heat to melt the cheddar before serving.