In a stand mixer, add flour, salt, avocado, egg, oil, and sparkling water. Mix on low using a paddle attachment until dough comes together and forms a ball.
Remove from bowl and knead on a lightly floured surface for 1 to 2 minutes.
Divide into six 5-oz pieces, cover in plastic wrap, and refrigerate for 1 hour.
Roll each piece of dough into a 4"x7", 1/4-inch-thick rectangle. Brush each rectangle with 1 tsp of butter, then spoon 1/2 cup of the Avocado Cheese filling onto the center of each rectangle.
Fold the longer sides of the dough toward the center, leaving some filling exposed. Pinch and twist the ends to form a "boat".
Place the khachapuri on a lined baking sheet and bake for 25 minutes.
Remove from oven. Make an indentation in the center of the exposed filling of each khachapuri and place 1 egg yolk. Sprinkle with 2 tbsp of mozzarella cheese and return to the oven to bake for 10 to 12 minutes until yolk is cooked to desired doneness and the bread is golden brown.
Serve topped with avocados.
Avocado Cheese Filling Directions:
In a large bowl, add all ingredients and mix until well combined.
Use immediately or refrigerate in an airtight container until ready to use.
Did you know the avocado is a fruit, not a vegetable? Learn more about the amazing avocado, including its rich history, cultural impact and tasty ways to eat this delicious superfood in guacamole as well as other dishes!
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