Visually appealing heterogeneous puffed flaked Ready-to-Eat ("R-T-E") cereal products with varied texture and density have a first continuous denser portion and a second discontinuous portion in the form of more highly puffed discrete regions. The R-T-E cereal products are fabricated from a dried heterogeneous cooked cereal mass comprising a continuous phase provided by macerated cooked cereal ingredients, e.g., cut whole wheat and a discontinuous phase containing added discrete hydrated intact parboiled medium grain rice. The cereal products are made by preparation methods involving forming the workable heterogonous cooked cereal dough into wet pellets having discrete pieces of the parboiled rice; drying the wet pellets to form dried pellets; flaking the dried pellets to form wet flakes; and, heating the wet flakes to dry and puff the flakes to form puffed flakes having 2-5% moisture and bulk density of 270-480 g/liter. The flakes can be pre-sweetened.