In a medium saucepan, combine olive oil, cream, milk, corn syrup, and salt. Cook over medium heat, stirring occasionally, until hot to touch, about 5 minutes.
Add chocolate chips and blend until smooth, using an immersion blender (or reduce heat to low and whisk until very smooth). Serve warm and stir before using. Make ahead: Chill airtight up to 2 weeks; microwave until pourable.