2 Sorry, forgot a very major ingredient: the meat!
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I don't think egg McMuffin contains mayonnaise at all. Try just English Muffin (not a high-quality sourdough-y fancy Thomas, etc. or other name-brand one either - no whole wheat or raisin either, obviously; use the most inexpensive you can find, maybe a supermarket store brand that might tend to be a teensy bit sweeter than the others), a little butter (or marg.),; thoroughly fried egg (broken yolk); couple strips bacon, or a very thin Canadian bacon or ham slice; and yes, American cheese slice (that part you are spot-on). Don't know 100% McDonalds, but that's how Jack-in-the-Box made them (well, they used hamburger bun, I guess...) --- yum. My favorite thing from fast-food.

I don't think egg McMuffin contains mayonnaise at all. Try just English Muffin (not a high-quality sourdough-y fancy Thomas, etc. or other name-brand one either - no whole wheat or raisin either, obviously; use the most inexpensive you can find, maybe a supermarket store brand that might tend to be a teensy bit sweeter than the others), a little butter (or marg.), thoroughly fried egg (broken yolk), and yes, American cheese slice (that part you are spot-on). Don't know 100% McDonalds, but that's how Jack-in-the-Box made them (well, they used hamburger bun, I guess...) --- yum. My favorite thing from fast-food.

I don't think egg McMuffin contains mayonnaise at all. Try just English Muffin (not a high-quality sourdough-y fancy Thomas, etc. or other name-brand one either - no whole wheat or raisin either, obviously; use the most inexpensive you can find, maybe a supermarket store brand that might tend to be a teensy bit sweeter than the others), a little butter (or marg.); thoroughly fried egg (broken yolk); couple strips bacon, or a very thin Canadian bacon or ham slice; and yes, American cheese slice (that part you are spot-on). Don't know 100% McDonalds, but that's how Jack-in-the-Box made them (well, they used hamburger bun, I guess...) --- yum. My favorite thing from fast-food.

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source | link

I don't think egg McMuffin contains mayonnaise at all. Try just English Muffin (not a high-quality sourdough-y fancy Thomas, etc. or other name-brand one either - no whole wheat or raisin either, obviously; use the most inexpensive you can find, maybe a supermarket store brand that might tend to be a teensy bit sweeter than the others), a little butter (or marg.), thoroughly fried egg (broken yolk), and yes, American cheese slice (that part you are spot-on). Don't know 100% McDonalds, but that's how Jack-in-the-Box made them (well, they used hamburger bun, I guess...) --- yum. My favorite thing from fast-food.