Heat a large non-stick skillet over medium-high heat. Combine butter and maple syrup and heat until the butter is melted and is beginning to bubble. Add the apples to the skillet and cook until they’re slightly golden and beginning to soften (about 12-15 minutes). Put the apples in a small bowl, turn off the heat, and wipe out the skillet.
In a wide, shallow bowl, combine the yogurt, eggs, salt, spices, and vanilla extract. Whisk until smooth and set aside.
Heat the same large non- skillet you used to cook the apples over medium heat. Add 2 tablespoons of butter to the skillet and melt.
Dip four honey cake slices in the yogurt-egg mixture, flipping once until totally soaked through. Add to the hot, buttered skillet and cook until golden brown on both sides, about 2-3 minutes. Continue with the four remaining honey cake slices.
Top with caramelized apples and maple syrup.