Problem-context: Across the EU, between 60 and 70% of soils are unhealthy, as an outcome of erosion, contamination and unsustainable management practices, among other factors. Soil degradation in turn affects water pollution, biodiversity loss, climate change, as well as food security, human health and the climate. On the other hand, bio-waste, which is a valuable resource for improving soil fertility, is accumulating in cities where circa 80% of its volume is currently incinerated or landfilled, thereby contributing to an unsustainable, linear, food supply chain structure. Even though several solutions already exist for bio-waste collection and recycling into soil improvers, only 17% of municipal waste is composted and recycled as soil nutrients. Leaning goals: This workshop aims to address the pressing issue of soil degradation and to close the gap between urban biowaste and soil health from a multi-actor perspective, by taking Amsterdam as a case study. The ultimate goal is to support EU cities in becoming active agents in regenerative soil systems by identifying and upscaling feasible soil solutions and practices for the recycling of biowaste. Workshop approach: This workshop goes beyond traditional discussions by employing systems thinking in a participatory causal mapping approach in four steps: 1. Introduction to systems thinking: You will have the opportunity to delve into the principles of system dynamics, feedback loops, and the causal mapping procedure. 2. Identification of influencing factors: We will engage in a dynamic process encouraging collective brainstorming of factors affecting the relation between urban biowaste and soil health. By leveraging the collective wisdom of multiple actor groups, we aim to identify key systemic drivers and barriers in the Amsterdam context. 3. Creating a causal map: We will create fuzzy cognitive maps (FCMs) by discussing, weighing and visualising the causal relationships between the environmental, social and economic factors identified before. 4. Identification of solutions: With the help of the FCMs, we will identify effective solutions, supporting policies and sustainable practices for collecting and valorising bio-waste and to boost soil health in the metropolitan region of Amsterdam. Take-home result: The combination of a participatory, multi-actor and systems approach can support shared outcomes from a diverse array of perspectives in a complex problem context. Hence, the workshop provides a systemic co-creation approach in assessing and addressing critical environmental, social and economic issues associated with restoring soil health from an urban perspective.