Thick, rich, chewy, and gooey!
The interior texture of cake is called the crumb. Cake crumb should be tender and break apart easily, compared to bread which should be chewy and elastic.
A cake, thinner than a bannock, made of wheat or barley or oat meal.
A disaccharide
Avena is made from oat grains. It is a type of oatmeal that is typically ground into a fine powder and used as a base for various oat-based products such as oat milk or oat flour.
In my experience the temperature of the oven makes no difference, but it is how you make them that makes them chewy or not. Most brownie mixes tell you how to mix it to make them cake like or chewy.
Oat.
NO! I tried. It was terrible. I guess you could make them but they are very chewy and not that good.
When "worked up" by mixing or kneading, gluten makes dough elastic and the finished product chewy. This is desirable in bread but undesirable in cake which should have a "tender crumb" without being chewy or tough like bread. This is why bread flour has higher gluten content than cake flour.
oat
Bread flour has more gluten than cake flour. Gluten is the protein in flour that produces elastic, stretchy dough and chewy breads.
Hard on the outside but chewy on the inside.