Preheat the oven to 180c (350f). Butter the bundt cake pan with room-temperature butter and flour to prevent the cake from sticking to the pan.
In a big mixing bowl, add the room-temperature butter, sugar, vanilla extract, and kosher salt, and mix with an electric hand mixer until it's creamy. Add the eggs and mix until well combined.
Add the strawberry puree, strawberry powder, sour cream, and vegetable oil and mix until well combined.
Add ½ of the buttermilk mixture and ½ of the flour, and the baking powder, and mix until almost combined.
Add the rest of the flour and buttermilk and mix until just combined and there are no lumps of flour visible. Do not overmix to keep the cake moist.
Pour the cake batter into a buttered and floured prepared bundt pan and smooth the top with a spatula.
Bake in a 180c (350f) preheat oven for 50-60 minutes or until a toothpick inserted into the cake comes out clean.
Allow the cake to cool to room temperature before flipping the cake. Top the pan with a plate, flip the cake, and tap the cake pan to release the cake from the pan.
Make the strawberry glaze by mixing together the powdered sugar, strawberry powder, vanilla extract, and milk in a small mixing bowl.
Top the cake with the glaze and let it sit for a few minutes before serving. Enjoy!