Nucleo Breakout Boards
Nucleo board are great; they’re cheap, they have heaps or processing power, and you have dozens of STM32 MCU’s you can choose from for the pheripherals you need. They do have one mayor downside; they use the Arduino Nano form factor, and are on their own impossible to make a mechanically reliable prototype setup with.
Therefor I present; Freshly delivered over-engineered breakout boards! Machined female headers, (not the ones that will leave your pins hanging after 10 insertion cycles), cage clamp screw terminals (instead of the usual round ones with a little lip that keeps pushing your cables out), and purple and gold PCBs that will be perfectly solderable for years to come.