In Units > Verbs in the Infinitive 2 > Lesson 1: Using Adjectives With Verbs in the Infinitive this sentence,
«Esta é a receita mais fácil de seguir,»
is translated as,
“This is the easiest recipe to follow.”
How, then, does one say, instead,
“This is the easier recipe to follow?”
Olá, @sheepdog 
This is covered in this Learning Note: Degrees of Adjectives | Practice Portuguese
The example you shared is indeed showing the (relative) superlative form of the adjective fácil. We know it’s superlative because of the definite article a (the): …a [receita] mais fácil…
In this case, to bring it down to the comparative degree, we just need to remove that definite article. This is what we’d get:
^ Note that this is the only acceptable word order, unlike in the relative superlative, where you can say either “Esta é a receita mais fácil…” or “Esta receita é a mais fácil…”.
Thank you for the explanation. However, I would point out that the Degrees of Adjectives | Practice Portuguese that you reference does not discuss the need to change the word order, as you have. This is what was confusing to me, and that explanation makes all the difference.
I’ll make a note to add that detail! Thanks.