Preheat the oven to 425°F.
Place the corn onto a sheet pan and generously coat all over with avocado oil OR melted clarified butter. Sprinkle generously with kosher salt.
Roast for 20 minutes, rotating once halfway through, until the corn is lightly blistered and golden in spots. You still want the kernels juicy and sweet while getting a little caramelization around the edges.
While the corn roasts, prep the rest of the salad ingredients and dressing ingredients so everything is ready to go.
Optional if making your own quick pickled onions or shallots: add the sliced red onion or shallots to a small bowl with the red wine vinegar and a pinch of salt. Toss together and let sit while the corn roasts to lightly pickle and soften. Otherwise, you can use premade pickled onions. I got mine from Trader Joe’s.
Let the corn cool slightly before slicing the kernels off all 6 ears of corn. Reserve the kernels from 2 ears for the dressing and place the kernels from the remaining 4 ears into a large bowl for the salad.
Add the reserved corn kernels for the dressing to a blender along with the olive oil mayonnaise, parmesan, lemon juice, white wine vinegar, garlic, Dijon, Calabrian chili paste or fresh red chili, Worcestershire, hot honey or maple syrup, olive oil, a big pinch of salt, and lots of black pepper. If using a fresh chili, you can leave all the seeds, remove some, or remove them completely depending on your heat preference. The chili still adds great flavor either way.
Blend until smooth and creamy. Add a splash of cold water as needed until the dressing becomes silky and pourable. Taste and adjust seasoning, parmesan level, sweetness, or spice as desired.
If making the buttery cornbread breadcrumbs, melt the salted butter in a skillet over medium heat. Add the cornbread breadcrumbs and toast, stirring often, until deeply golden brown and crisp. Finish with black pepper.
If you made your own quick pickled onions or shallots, roughly chop them.
Add the chopped romaine to the bowl with the roasted corn along with lots of shaved parmesan and the pickled onions or shallots.
Drizzle generously with the spicy corn Caesar dressing and toss until evenly coated.
Top with extra parmesan, black pepper, and the buttery cornbread breadcrumbs if using.
Serve immediately.