  The vanishing band gap of graphene has long presented challenges for making
high-quality quantum point contacts (QPCs) -- the partially transparent p-n
interfaces introduced by conventional split-gates tend to short the QPC. This
complication has hindered the fabrication of graphene quantum Hall
Fabry-P\'erot interferometers, until recent advances have allowed split-gate
QPCs to operate utilizing the highly resistive $\nu=0$ state. Here, we present
a simple recipe to fabricate QPCs by etching a narrow trench in the graphene
sheet to separate the conducting channel from self-aligned graphene side gates.
We demonstrate operation of the individual QPCs in the quantum Hall regime, and
further utilize these QPCs to create and study a quantum Hall interferometer.
