A method for preparing compositions comprising heat labile milk proteins is disclosed herein. In certain embodiments the method involves subjecting a first composition comprising a fat or lipid source and a protein source to a temperature of at least about 130°C and combining the first composition with a second composition comprising a heat labile milk protein. In another embodiment the method includes combining a first composition comprising a fat or lipid source and a protein source that has been subjected to a temperature of at least about 130°C with a composition comprising a heat labile milk protein to form a third composition including a fat or lipid source a protein source and a heat labile milk protein and packaging the third composition aseptically.
