Verse Ex29-02 discussing the unleavened-bread offerings made by the priest states and unleavened bread, and
• cakes unleavened mingled with oil, and
• wafers unleavened spread with oil;
of fine wheaten flour shalt thou make them. From this verse we infer that there at least two types of unleavened bread offerings:
• Unleavened Cake offerings: The uncooked flour was mixed with oil
• Unleavened wafer offerings: The cooked flour was spread with oil
In fact we can find 5 types of Minchah offerings listed in Lv02. These are two of them.

Advanced Rashi: Notice how Rashi a06s that for the cake offering the oil was mixed with the raw flour while for the wafer offering the oil was spread on the cooked flour. Rashi, following the Talmud derives this from logic. You can't mix oil with a hard substance and you can't spread oil on a mushy substance. Hence Rashi assumes that for the cake offerings the mixing was done before cooking while for the wafer offerings the spreading was done after cooking.