Beat confectioners' sugar, 2 tablespoons butter, corn syrup, vanilla extract, pinch salt, and yellow food coloring together in a bowl until smooth, adding food coloring as necessary until your desired "yolk" color is reached. Cover the bowl with plastic wrap and refrigerate until cold, at least 30 minutes.
Melt 6 tablespoons butter in a pot over medium-high heat until butter turns golden and has a nutty fragrance, about 5 minutes. Reduce heat to medium-low, add marshmallows and peanut butter, and cook and stir until marshmallows and peanut butter are melted and mixture is well-combined. Remove from heat.
Stir rice cereal and kosher salt into marshmallow mixture until cereal treat mixture is well-combined. Cool to room temperature.
Roll "yolk" mixture into gumball-size balls, about 1/2 teaspoon "yolk" mixture per ball. Scoop about 1/3 cup cereal treat mixture into your hand and form it into a 2-inch round; press an indentation into the center with your finger and place 1 "yolk" in the indentation. Wrap the cereal treat around the "yolk" and squeeze firmly to form an egg shape. Repeat with remaining cereal treat mixture and "yolks." Set completed "eggs" on a plate and refrigerate until firmed, at least 15 minutes.
Melt chocolate in the top of a double boiler over simmering water, stirring frequently and scraping down the sides with a rubber spatula to avoid scorching. Use 2 forks to dip each cereal "egg" into chocolate to coat completely. Place finished eggs on a plate and refrigerate until chocolate sets, at least 15 minutes.
