Related do Challa 1:6

They do not fulfill [their obligation of eating unleavened bread] with chalut (dough kneaded with hot water), nor with meisah (flour mixed with boiling water, see Challah 1:6), and not with sponge-cakes (contra Tos. Pesachim 2:11), and not with honey-cakes, but he may fill his belly with them [on Passover night] provided that he eats [at least] an olive's-bulk of matzah after doing so. They fulfill [their obligation] with spiced matzah, whether it was spiced in a stew-pot or whether it was spiced in cooking pot. They [also] fulfill [their obligation] with a chararah (a thin cake baked on coals), and with matzah [made from] old grain, as long it was made from the start in the name of Passover (i.e., one had in mind that it was being made for the purpose of fulfilling the obligation).

Rabbi Yose says: there are six instances of lenient rulings by Beth Shammai and stringent rulings by Beth Hillel.A fowl may be put on a table [together] with cheese but may not be eaten [with it], according to the opinion of Beth Shammai. But Beth Hillel says: it may neither be put on [the table together with it] nor eaten [with it]. Olives may be given as terumah for oil and grapes for wine, according to the opinion of Beth Shammai. But Beth Hillel says: they may not be given. One who sows seed [within] four cubits of a vineyard: Beth Shammai says: he has caused one row [of vines] to be prohibited. But Beth Hillel says: he has caused two rows to be prohibited. Flour paste [flour that had been mixed with boiling water]: Beth Shammai exempts [from the law of hallah]; But Beth Hillel pronounces it liable. One may immerse oneself in a rain-torrent, according to the opinion of Beth Shammai; But Beth Hillel say: one may not immerse oneself [therein]. One who became a proselyte on the eve of Passover: Beth Shammai says: he may immerse himself and eat his Passover sacrifice in the evening. But Beth Hillel says: one who separates himself from uncircumcision is as one who separates himself from the grave.