La tortilla de patata quedó muy buena.

Here quedar means to turn out or to come out in the sense of a final result.

So La tortilla de patata quedó muy buena means something like:

• The potato omelette turned out very well / very good

This is a very common use of quedar in Spanish when talking about how something ends up after being made, cooked, arranged, written, etc.

Examples:

• La cena quedó fantástica. — The dinner turned out fantastic.
• El dibujo quedó muy bonito. — The drawing turned out very nice.
• La habitación quedó perfecta. — The room ended up perfect.

So this is not the quedar of to meet up or to stay. It is the result meaning.

Quedó is the preterite form, used for a completed action or finished result in the past.

• queda = present: it turns out / it is left / it ends up
• quedó = past: it turned out

Since the sentence talks about a tortilla that has already been made and we are now describing the result, the past tense makes sense:

• La tortilla quedó muy buena. — The tortilla turned out very good.

If you said queda muy buena, it would usually sound more general, like a recipe comment:

• Con cebolla, la tortilla queda muy buena. — With onion, the tortilla turns out very good.

Because it agrees with la tortilla, which is a feminine singular noun.

In Spanish, adjectives usually agree in gender and number with the noun they describe.

• la tortilla → feminine singular
• therefore → buena

Compare:

• El pastel quedó muy bueno. — masculine singular
• La tortilla quedó muy buena. — feminine singular
• Las tortillas quedaron muy buenas. — feminine plural

Because buena is an adjective, and adjectives are modified by muy, not mucho/a.

• muy bueno/a = very good
• mucho/a usually means much/a lot of, not very

So:

• muy buena = very good

As for muy bien:

• bien is an adverb, often used for how something is done
• buena is an adjective, describing the tortilla itself

Both can appear in similar contexts, but they are not exactly the same:

• La tortilla quedó muy buena. — The tortilla turned out very good.
• La tortilla salió muy bien. — The tortilla turned out very well.

The first focuses more on the quality of the tortilla itself. The second focuses more on the overall result.

Yes, but it means something slightly different.

• quedó muy buena focuses on the result after making it: it turned out very good
• estaba muy buena describes how it was when you ate it: it was very tasty

So:

• La tortilla de patata quedó muy buena.
  = It turned out well as a finished dish.

• La tortilla de patata estaba muy buena.
  = It tasted very good / it was delicious.

In many real-life situations, both are possible, but quedó highlights the process and result of cooking.

Yes. Salir is also very common for food and recipes.

• La tortilla quedó muy buena.
• La tortilla salió muy buena.

Both can mean The tortilla turned out very good.

A rough nuance:

• quedar often emphasizes the final state or appearance/result
• salir often emphasizes how the attempt or preparation went

In everyday Spanish, especially with food, both are very natural.

Examples:

• El bizcocho salió perfecto.
• La salsa quedó riquísima.

La is the definite article, meaning the.

It is used because the speaker is talking about a specific tortilla, probably one that was just made or that both speakers know about.

• La tortilla de patata quedó muy buena. — The potato omelette turned out very good.

Without the article, the sentence would sound unnatural in normal Spanish.

Spanish uses articles more often than English does, especially with nouns referring to concrete things.

Tortilla de patata is the standard name of the dish in Spain. Here de is part of the fixed expression naming what kind of tortilla it is.

So:

• tortilla de patata = potato omelette / Spanish omelette

You might sometimes hear:

• tortilla con patata but that sounds less like the established dish name and more like a descriptive phrase such as an omelette with potato.

In Spain, the usual dish name is:

• tortilla de patata or
• tortilla de patatas

Both are used in Spain, and both are correct.

• tortilla de patata
• tortilla de patatas

The singular and plural both exist in actual usage. Which one sounds more natural can depend on the region or the speaker.

So if you hear either one, do not worry: they both refer to the same Spanish dish.

No. In Spain, tortilla usually means an omelette-like egg dish, not a flatbread.

So tortilla de patata in Spain is the famous dish made with eggs and potatoes.

This is an important Spain-vs-Latin-America vocabulary point:

• In Spain, tortilla usually means omelette
• In much of Latin America, tortilla usually means flatbread, like a corn or flour tortilla

The structure is:

• La tortilla de patata = subject
• quedó = verb
• muy buena = description of the resulting state

So the pattern is:

[thing] + quedar + adjective

Examples:

• La sopa quedó salada. — The soup turned out salty.
• El arroz quedó seco. — The rice turned out dry.
• Las croquetas quedaron buenas. — The croquettes turned out good.

This is a very useful pattern for talking about cooking results.

Yes. In food contexts, bueno/a very often means good-tasting, nice, or delicious, depending on tone and context.

So muy buena here is not just morally or abstractly good. It means the tortilla was of very good quality, especially in taste.

Depending on context, English translations could be:

• very good
• really tasty
• delicious

If you want a stronger version in Spanish, you could also hear:

• quedó riquísima
• quedó deliciosa

But muy buena is completely natural and very common.