Preheat oven to 350 degrees and line two baking sheets with parchment paper.
In a large bowl, whisk together cake mix and salt.
Mix in melted butter, egg, oil, lemon juice (if using), and lemon zest (if using), until a soft dough forms.
Scoop roughly 1 ½ tablespoon portions of dough (I use a #40 cookie scoop) and roll into balls.
Optional: Roll each ball in confectioners' sugar.
Place dough balls about 2 inches apart on prepared baking sheet and gently flatten slightly with the palm of your hand.
Bake for 9-11 minutes, until the edges are just set, but centers are soft.
Let cool on baking sheet for a few minutes before moving to wire rack to cool completely.
Frost cookies and top with sprinkles, if desired.