Peanut Butter Oat Blondies with Peanut Butter Drizzle (Vegan and Gluten-Free)

These peanut butter oat blondies are dense, peanut buttery, gooey, and almost
fudgy. They're (optionally) topped with a thick, fudge-like peanut butter
drizzle. And by "drizzle," I mean "turn your bowl upside down and let that
glorious peanut butter mixture rain down." The blondies come together in a flash
and require just 8 ingredients (salt included). And those 8 ingredients are
completely nonsense-free -- no refined sugars, processed flours, or other funny
business, which means there's more room for the good stuff.