It is the ninth time in 10 games that Foster has reached double figures for the Wildcats.
Despite its undersized roster Kansas State dominated the Trojans on the boards grabbing 17 rebounds on the offensive end and 44 total.
Antoine Myers had 12 points and Wes Hinton added 10 points to pace the Trojans.
Kansas State entered the game with the Big 12's best scoring defense at 61.2 points while also holding opponents to 26 percent shooting from 3-point range.
The Trojans finished at 36.2 shooting while converting on just 3-19 from 3-point range.
The Wildcats left little doubt from the start. Seven points from Foster backed an opening 14-2 run by the Wildcats over the first four minutes of the first half.
The scoring run was aided by a clean and crisp Kansas State offense that didn't see its first turnover until the 9:58 mark of the first half. The Wildcats finished the game with only eight turnovers.
The Wildcats used a dozen assists to break apart the Trojans' 3-2 zone and score 18 first-half points in the paint.
Kansas State shot 40.5 percent from the field in the first half and pulled down an impressive 28 rebounds. The number was evenly split on both ends of the floor.
Troy's 15 first-half points were its lowest output since facing Arkansas State last season.
Kansas State used another strong scoring run to open the second half, pushing its lead to 50-17. The 33-point margin was the largest of the contest.
The Trojans added back-to-back 3-point baskets from Wes Hinton to cut the Wildcat lead to 23 points, but an 11-3 run quickly pushed the margin back to 31 points.
Spradling added eight of his season-high points in the second half.