In a small saucepan, combine 1 large egg, 1/2 cup fresh lemon juice, 1 tablespoon lemon zest, and 1/2 cup sugar. Cook over low heat, whisking constantly for about 5 minutes, until the mixture thickens and coats the back of a spoon. Remove from heat, stir in 4 tablespoons of butter until melted, and let it cool completely before using.

In a medium mixing bowl, combine 1 cup rolled oats, 1 cup milk, 1/2 cup Greek yogurt, 2 tablespoons chia seeds, 2 tablespoons honey or maple syrup, and 1 teaspoon vanilla extract. Stir well until all ingredients are fully combined, creating a creamy base.

Grab a mason jar or any airtight container. Spoon half of the oats mixture into the bottom, followed by a generous layer of the prepared lemon curd. Then, top with the remaining oats mixture.

Seal the mason jar tightly and place it in the refrigerator. Allow the Lemon Curd Overnight Oats to chill for at least 4 hours, or ideally overnight.

When ready to enjoy, take them out of the fridge. Top with granola, extra lemon zest, and a drizzle of honey or maple syrup. Mix and savor!