Help the head judge complete the rules of the magical baking tournament by selecting the correct pronoun.

The Golden Spatula will be awarded to ___ can bake a pie that genuinely sings a lullaby.

The correct answer is whoever.

Although the pronoun follows the preposition "to," the entire nominal relative clause ("whoever can bake...") functions as the object of that preposition. Within its own clause, whoever is the subject of the verb phrase "can bake." Using whomever here is a common trap!