RecruitingBehavioural interventionBrain Activity Changes After Cognitive Behavioral Therapy for Anxiety in Autistic Youth From High-Need CommunitiesThe goal of this clinical trial is to investigate neural constructs related to anxiety symptoms in response to Facing Your Fears (FYF) treatment in autistic participants with co-occurring anxiety. Researchers will compare participants receiving immediate FYF intervention to those in the waitlist control group (receiving treatment as usual) to see if there are differences in neural constructs and anxiety symptom changes over the study period. Participants will: * Complete the Facing Your Fears (FYF) intervention if assigned to the immediate treatment group * Continue their usual treatment during a waitlist period if assigned to the control group, followed by the opportunity to participate in FYF intervention after the waiting period ends * Complete assessments of neural constructs, anxiety symptoms, and other measures