The original Cook Like A Boss camp style intervention, was based on the Cook-Ed Model (Asher et al., 2020) and underpinned by SLT and ELT (Bandura & McClelland, 1977; Kolb, 1984). The content was developed to ensure it was age-appropriate in line with the guidelines (Dean et al., 2021a) and included co-creation. The camp was designed to introduce the children to a range of food and skills and to nurture an initial interest in cooking. The adapted online version of the camp included five daily videos of the original chef performing the recipes. Minor adaptions included the removal of cooking pasta from scratch due to equipment concerns, reordering the days, and chef suggestions around alternative equipment/ingredients to use. The five daily videos were: 1) Introduction & flatbreads; 2) Chicken Chowder; 3) Baking day; 4) Chilli non Carne; 5) Honey Chilli Chicken

The original Cook Like A Boss camp style intervention, was based on the Cook-Ed Model (Asher et al., 2020) and underpinned by SLT and ELT (Bandura & McClelland, 1977; Kolb, 1984). The content was developed to ensure it was age-appropriate in line with the guidelines (Dean et al., 2021a) and included co-creation. The camp was designed to introduce the children to a range of food and skills and to nurture an initial interest in cooking. The adapted online version of the camp included five daily videos of the original chef performing the recipes. Minor adaptions included the removal of cooking pasta from scratch due to equipment concerns, reordering the days, and chef suggestions around alternative equipment/ingredients to use. The five daily videos were: 1) Introduction & flatbreads; 2) Chicken Chowder; 3) Baking day; 4) Chilli non Carne; 5) Honey Chilli Chicken

Validated measure of perceived cooking competence (Dean et al., 2021b), completed by children. CooC11 is an 11-item measure used to assess children aged 8-12 years on their perceived competence of their cooking skills, including skills such as chopping, peeling, weighing ingredients and using an oven. Children are shown illustrations of characters and asked whether they do the skill, if they respond yes, they are then shown two illustrations one of a 'good' performance of a skill and one of a 'poor' performance. The child is then asked which image they are most like on a five point Likert scale. The sequence of presentation of 'good' and 'poor' performance of a skill alternated, and scores were reverse coded where necessary so that a higher score indicated a higher perceived competence. The score for each skill is then summed to create a total cooking competence score, with possible scores ranging from 0 to 55.

Validated measure of perceived motor competence (Barnett et al., 2015), completed by the children. This is a 12-item measure, where children are shown images of children performing different physical activities and asked to pick which child they are like.

Validated measure of wellbeing (Liddle and Carter, 2015), completed by the children. This is a 15-item measure, where children select one of the following responses for the 15-items: 'Never,' 'Not much of the time,' 'Some of the time,' 'Quite a lot of the time,' 'All of the time.'

Both parents and children answered a number of questions relating to their experiences of camp. Parents completed questions relating to the number of videos completed, rating their child's experience of camp, would they encourage their children to take part in more cooking activities in the home, surprise around children's abilities, changes in their children's cooking confidence. Children completed questions relating to enjoyment of camp, whether they would take part again, favourite part of camp, and what they learnt in camp.