Following his senior season at Villanova, Paschall was selected by the Warriors with the 41st overall pick in the 2019 NBA Draft. He made his NBA debut during the first game of the season, Oct. 24 against the Clippers. He posted 14 points (6-13 FG, 0-1 3Pt, 2-3 FT), four rebounds, three assists and two steals in 31 minutes. Paschall erupted for his best performance of the season soon after, Nov. 4 in a game against the Trail Blazers. In 30 minutes, Paschall recorded 34 points (11-19 FG, 4-6 3Pt, 8-8 FT), 13 rebounds and one block. His longest double-digit scoring streak of the season stood at 13 games and occurred between Nov. 13 and Dec. 6. In 33.0 minutes per game, Paschall averaged 18.2 points, 6.1 rebounds and 2.1 assists. Paschall also ended the season on a 10-game streak of double-digit scoring, where he averaged 17.0 points, 4.3 rebounds and 4.0 assists across 31.5 minutes. Paschall set single-game career highs of 34 points, 13 rebounds, eight assists, five steals and two blocks. He also had four double-doubles. Overall, he shot 49.7 percent from the field, 28.7 percent on threes on 2.2 attempts and 77.4 percent from the free-throw line.