Heat oven to 425°F. In 2- to 3-quart saucepan, stir together peaches, brown sugar, vinegar, pumpkin pie spice and 1/2 teaspoon salt. Heat to boiling; reduce heat to medium. Simmer uncovered about 20 minutes, stirring occasionally, until peaches are tender. Stir in chili sauce. Remove from heat. Use an immersion blender or process peach mixture in food processor until smooth.