Peel avocado, add flesh to a medium bowl. Using a fork, mash the avocado.
Cut hard boiled eggs in half lengthwise. Gently scoop out the egg yolks and add to the mashed avocado.
To the avocado and yolks, add sour cream, lemon juice, salt, and pepper. Using a fork, mix to combine. Taste and season with additional salt and pepper if desired.
Gently rinse the egg whites to remove residue and gently pat dry.
Transfer the avocado egg yolk mixture into a piping bag or zip top bag**. Carefully pipe the mixture into the hollows of the egg whites. If desired, garnish the deviled eggs with parsley and paprika and place on a plate for serving.
Notes
*To make hard boiled eggs
Place a medium pot on medium-high heat. Once water is boiling, carefully add the eggs. Cook for 10 minutes. Carefully remove eggs and transfer them to a bowl filled with ice water to cool.
**Alternately, use a spoon to fill the egg whites with the avocado yolk mixture.