Augmented Reality (AR) has great potential to facilitate multisensorial and experiential learning. However, creating activities in AR for everyday classroom use is far from an easy task for non-experts users, such as teachers and learners. To examine if and how an authoring approach for AR can be beneficial for educational contexts, we first designed MIXAP through a participatory design with 19 pilot teachers. MIXAP enables non-expert users to create AR activities using interactive and visual authoring workflows. To evaluate our approach with a wider audience of teachers, we conducted a study with 39 teachers examining the usability, utility, acceptability, and transfer between pilot and non-pilot teachers. We found that this approach can help teachers create quality educational AR activities. For both groups, the effect sizes were significantly large for ease of use, emotional experience, and low cognitive load. Additionally, we found that there is no significant difference between the pilot and non-pilot teachers in terms of ease of use, learnability, emotional experience, and cognitive load, highlighting the transfer of our approach to a wider audience. Ultimately, we discuss our results and propose perspectives.