Place the bacon in a cold medium (or large) saucepan and place it over medium-high heat.
Cook until the bacon bits are crispy, then remove them from the pan and place them on a paper towel to absorb excess oil. Set aside for later.
Place the saucepan back over the heat, add the chopped leeks, and sauté until they have softened.
Add the potatoes and mix until everything is combined.
Pour the stock into the saucepan, mix, then cover with a lid and bring to a boil.
Lower the heat and simmer until the vegetables become tender and cooked.
Remove the saucepan from the heat and use an immersion blender to puree the soup.
Place it back into the heat, taste, and adjust the seasoning by adding salt and ground black pepper.
Place the lid back on and continue cooking for an additional couple of minutes.
Take the pan off the heat and transfer your potato and leek soup into bowls.
Garnish with the bacon bits from earlier, then serve!