My favourite methods focus on delivery over theory.
At the end of the day, we want to make stuff real so we can see whether it was a good idea in the first place, not just create a deck with some musings in.
Design Sprints and workshops
Getting to a solution fast involves rapid collaboration with the team and stakeholders. I've facilitated workshops and Design Sprints for brands such as Toyota and Philips. I've also had the pleasure of running a Design Sprint at Madrid University with MA Innovation students.
Contextual Inquiry and Context Mapping

Contextual inquiry involves watching people in their natural environment interacting with the products that we're aiming to improve. 

Context Mapping takes this one step further by getting customers to keep a diary and then workshop through solutions to their painpoints. The solutions provide deeper insights into what people really want.

Experience Flows and Ecosystem Maps

All too often insights get delivered in a long form deck where it will likely gather dust and not get absorbed by the key stakeholders. I prefer to create artifacts such as Experience Flows that are visual and show a narrative alongside the insights.

High-fidelity prototyping and interaction design

Evolving ideas from a sketch to a working ‘thing' is one of my favourite activities. From quick flows to fully coded prototypes I can usually find a way to make any interaction or flow the team can dream up.