I start by cracking the eggs into a large bowl, then adding the heavy cream, apple cider, brown sugar, cinnamon, and salt. I whisk everything together until it looks smooth and slightly foamy on top. This custard is really what carries all that fall flavor into the bread, so I like to give it an extra few seconds of whisking to make sure the sugar fully dissolves.
While the custard rests, I set my skillet over medium heat and let it warm up for a minute or two. Once it's hot, I add the butter and swirl it around so it coats the whole surface. A properly heated pan is what gives the French toast that crisp, golden edge instead of a soggy one.
I take one slice of bread at a time and lay it into the custard, letting it soak for a few seconds before flipping it over to coat the other side. I don't linger too long here, since bread that sits in the custard too long gets mushy and falls apart in the pan.
I lift the bread out, letting any extra custard drip back into the dish, then place it straight into the buttered pan. I cook it for about three minutes per side, watching for that deep golden-brown color before flipping. This step is where the magic really happens, since the outside gets crisp while the inside stays soft.
Once both sides are golden, I move the French toast straight to a plate and repeat the process with the remaining slices. I usually serve mine warm with a dusting of powdered sugar, though a drizzle of maple syrup never hurts either.