What is the best way to connect two decoupling capacitors to an MCU?
First one agrees with Recommended PCB routing guidelines for STM32F4xxxx devices AN4488
Application note.  Pin -&gt; thick track -&gt; cap -&gt; via.


Power supply decoupling
All power supply and ground pins must be properly connected to the power supplies. These
connections, including pads, tracks and vias should have as low impedance as possible. This is typically achieved with thick track widths and, preferably, the use of dedicated power supply planes in multilayer PCBs.