Within Australia, the prevalence of food insecure individuals increased from 2.6 million in 2014–2016 (10.8%) to 3.1 million in 2018–2020 (12.3%) due to the COVID-19 pandemic.⁽¹⁾ OzHarvest is a not-for-profit organisation that prioritises food salvaging, food waste prevention and nutrition education.⁽²⁾ OzHarvest's education sector facilitates a programme known as Nutrition Education Skills Training (NEST). NEST is a 6-week programme providing weekly workshops of 2.5-hour duration offering skills training on cooking simple, healthy, and affordable meals to adults at risk of food insecurity. This study aimed to determine the immediate and longer-term impacts of participation in NEST. A quasi-experimental study with pre-post surveys (n = 258) and follow-up surveys (n = 20) was conducted from June 2019 to July 2022. Survey results were obtained from NEST program participants (18 years) from Adelaide, Canberra, Melbourne, Newcastle, Queensland, and Sydney. Baseline (pre-) and post-surveys (at program completion) were administered to participants, with an option for a 6-month follow-up survey. Participants were required to complete both surveys to be eligible for this study. Questionnaires included 23 core questions adapted from previous studies,^{(Reference West, Lindberg and Ball3)} allowing evaluation of nutrition knowledge, confidence and self-efficacy, shopping, and food preparation behaviours, and eating behaviours. Food security was assessed using the standard 6-item indicator set for classifying households by food security status level. Using paired t-tests, Shapiro Wilks, and Wilcoxon sign-ranked tests for pre and post survey data, participants demonstrated overall improvement in nutrition knowledge (p < 0.001), confidence and self-efficacy (n = 222; p < 0.001) and food preparation behaviours (p < 0.001). The intake of discretionary foods overall decreased (p < 0.001) while fruit, vegetable and water intake increased (p < 0.001). Food security improved from 57% to 68% immediately within the population (p < 0.001). Using RMANOVA and Shapiro Wilks tests, the 6-month survey results were compared to the pre surveys suggested longer lasting improvements in nutrition knowledge (p < 0.001), cooking confidence (n = 8; p = 0.033), food preparation behaviours (p = 0.003), and increased vegetable intake (p = 0.032) and fruit intake (p = 0.012). Participation in OzHarvest's NEST programme results in short-term improvements in food security levels and dietary behaviours. Over the longer term, these changes were sustained but to a lesser degree, indicating that systemic changes are required to address underlying socioeconomic disadvantage.