In a small bowl, combine the ground turkey with dried sage, garlic powder, sea salt, and black pepper, mixing thoroughly.
Form the turkey mixture into a wide, flat patty that is slightly larger than the circumference of the English muffin.
Heat a non-stick skillet over medium heat with 0.5 tsp of avocado oil and cook the turkey patty for 4-5 minutes per side until fully cooked and browned.
While the sausage cooks, whisk the whole egg and egg whites together in a separate bowl until well combined.
Remove the sausage from the skillet and set aside; wipe the skillet clean and add the remaining 0.5 tsp of avocado oil.
Pour the egg mixture into the skillet and cook undisturbed for 2 minutes, then fold the edges inward to create a square shape that fits the muffin.
Split and toast the sprouted grain English muffin until the edges are golden and crisp.
Assemble the sandwich by placing the baby spinach on the bottom muffin half, followed by the turkey sausage patty, the folded eggs, and the sharp cheddar cheese.
Top with the remaining muffin half and let the sandwich rest for 30 seconds to allow the cheese to melt from the residual heat.