In a medium bowl, combine the ground turkey, dried sage, sea salt, black pepper, and the first 0.5 tablespoon of maple syrup; mix well and form into two flat patties.
In a separate small bowl, whisk together the oat flour, liquid egg whites, almond milk, and the remaining 0.5 tablespoon of maple syrup until a smooth batter forms.
Heat a large non-stick skillet over medium heat and add the ghee to coat the surface evenly.
Place the turkey patties in the skillet and cook for 4-5 minutes per side until they are fully cooked through and have a deep golden-brown exterior.
In the same skillet, pour the oat batter into two small, equal circles to create the griddle cakes, cooking for about 2 minutes per side until bubbles form and the edges are set.
Crack the large egg into the skillet and fry until the white is completely set but the yolk remains jammy.
Assemble the sandwich by placing one griddle cake on a plate, layering the turkey patties and fried egg on top, and finishing with the second griddle cake.