Providing a powder composition with low hygroscopicity, excellent storage stability, easy uniform dispersion of a core substance, a sufficient amount of the core substance, and excellent taste without attachment onto teeth even after addition to chewing gum or tablet confectioneries, which is preferable for use as an agent for giving aroma and flavor or an agent for enhancing aroma and flavor, as well as foods and drinks containing the same. The powder composition is produced by melting a carbohydrate mixture comprising 30 to 70% by mass of trehalose and a plasticizer under heating, adding a core substance to the resulting molten matter for mixing to obtain a uniform mixture, extruding the uniform mixture while cooling the uniform mixture, for solidification, and cutting or grinding the resulting solid matter. The resulting powder composition is kneaded with for example gum base, powder sugar, corn syrup and the like and is then spread into stick chewing gum.