Translation:Shulchan Aruch/Yoreh Deah/97
1. One may not knead dough with milk, lest one come to eat it with meat. If one did knead it that way, the whole loaf is prohibited even to eat alone. If it was a small quantity that can be eaten in one sitting, or its shape is unusual so it will be recognizable that it shouldn't be eaten with meat, it is permitted. One may not bake bread in an oven that was smeared with fat, and if one did, the rules are as for a dough kneaded with milk. Rema: Thus we are accustomed to knead bread with milk for Shavuot, and also fat for the honor of the Sabbath, because all of this is considered a small amount. Also, its shape is distinct from other bread. And all the more so [pastries made with meat like] phladan or pashtida are permitted (Hagahot S.D.) One should not bake bread with any [pastries made with meat like] phladan or pashtida in an oven, because it is considered possible that fat may leak onto the bread, and if it leaks under the bread it is as if the bread was kneaded with it (Beit Yosef in the name of the Hagahot Ashiri). The custom is to put the secondary (here: pareve) near the mouth of the oven (Beit Yosef in the name of the Hagahot S.D). And even if the food is in a pan (which would prevent the leaking problem) we are accustomed to be strict in the first instance.
2. An oven the was smeared with fat, we don't bake bread in it until it's heated from within until it turns white. And even if it's a tiled pan (meaning, an earthenware vessel that's heated from below and one bakes cookies on it) it is not permitted if heated from the outside.
3. Bread that was baked together with roasted meat, and fish the was roasted in a single oven together with meat, it's forbidden to eat them with milk. And this applies to a small oven, but with a large oven that holds twelve measures of esronim and has an open mouth, it is permitted. And if the roasted meat was covered, and so too a meat pie that whose hole was covered, it is permitted even in a narrow oven. And see later on in chapter 108 what the custom is.