In a small bowl, mix together yogurt, lemon juice, and lemon zest. Season with a pinch of salt and pepper.
2.
Heat a greased non-stick pan on medium low heat. Crack and pour eggs into the pan. Cook until whites are set, flip and cook for 1 minute for a runny yolk, 3 minutes for a fully cooked yolk. Turn off the heat and let sit while assembling sandwich.
3.
Place 2 slices of bread on 2 plates. Spread an even layer of the yogurt sauce over the toast. Top with a portion of arugula, avocado and egg, and pepitas if using. Top with other slice of bread. Cut the sandwich down the middle and serve.
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