Let's rip open this new, $6 board from Adafruit! It'll run CircuitPython or Arduino, and can be soldered onto another PCB, connected to STEMMA QT / Qwiic / Grove add-ons, or swapped out for the Seeeduino XIAO (though it has a couple extra features that make it super versatile). Watch for details!
// STEMMA QT: https://www.adafruit.com/category/620
// Qwiic modules: https://www.sparkfun.com/categories/399
// Flash chip: https://www.adafruit.com/product/4763