Most toaster ovens have three knobs: temperature, time, and a series of what sound like discrete settings (bake, toast, broil, etc.) but are actually a graduated spectrum for heat distribution to the top vs. bottom heating coil. Pretty much a perfect UX (though you could toss out the heat-distribution names), and makes me wish that everything else—actual ovens, actual toasters, and microwaves—shared it.

I had that too - Amana RadarRange. It was great for me. But terrible for little kids - up to school age. They would ask "How much time?" for their popcorn. I'd tell them. They'd turn the knob, it would go to some time, they'd ask "More or less?" We'd play that game until they had about the right time.

With a digital control, they'd just press 2-3-3 and Start.