There’s no single “correct” answer — it depends on taste — but most people would consider #3 the closest to perfectly cooked.
Here’s why:
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#1 – Barely toasted
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#2 – Lightly toasted
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#3 – Even golden-brown (classic “just right”)
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#4 – Darker, more crisp
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#5 – Very dark, close to burnt
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#6 – Burnt
Slice #3 has:
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An even golden color
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No blackened areas
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Crisp outside without being bitter
That’s typically what’s considered “toast perfection.”
Of course, if you like it crunchier, you might pick #4 😉