Preheat oven to 350°F.
In a stand mixer, whip eggs and white sugar on high speed for 5-7 minutes until fluffy.
Turn speed down to medium and slowly pour in vegetable oil. Then, add sour cream, vanilla extract, and buttermilk.
In a large bowl, sift together AP flour, cocoa powder, cinnamon, baking powder, baking soda, and salt.
Remove bowl from stand mixer and incorporate dry ingredients into cake batter, 1/3 at a time, with a silicon spatula.
Heat coffee in a heat-proof container until nearly boiling. Add to cake batter and carefully mix with spatula until a smooth batter forms.
Add cleaned blueberries and chocolate chips and fold through.
Line a 9” loaf tin with parchment paper. Pour in the cake batter and smooth on top.
Bake for 60 - 75 minutes until the cake springs back when pressed. Let cool for 30-60 minutes.
Remove cake from loaf tin and peel off parchment paper. In a separate bowl, mix together powdered sugar, lemon juice, and blueberry juice / puree.
The glaze should be pourable but thick. When cake is cool, spread glaze over the top. Slice and serve with extra blueberries.