In the sentence 'Roll out the ple (play) dough evenly.' ↦the adverb is evenly.
Adverbs typically express manner, place, time, frequency, degree, level of certainty, etc., answering questions such as how?, in what way?, when?, where?, and to what extent? (Wikipedia).
In the sentence given, evenly is the adverb as here we can ask the questions ↦ In what way should the play dough be rolled? How should the dough be rolled? etc.
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
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