Preheat oven to 350. Grease an 8" square pan and line with parchment (see notes). Gather all of your ingredients and make sure eggs are room temperature.
Melt butter in the same bowl you'll be mixing the batter in and make sure it's no longer hot before continuing.
Add brown sugar, ground coffee and salt to the butter and whisk until smooth.
Add eggs and vanilla and whisk to combine.
Sift flour and baking powder into butter/egg mixture and combine with a rubber spatula just until you can no longer see any traces of white flour.
In separate bowl combine your raw sugar, spices and sea salt. There is no measurement here for the salt, do this to taste. If you're unsure use 1/4 tsp this time and see how you like it.
Scrape batter into prepared pan and spread it evenly to all corners. Batter is very thick.
Sprinkle spice mixture evenly over blondies (you may not use all of it, depending on the size pans you use and personal preference)
Bake in your preheated 350 oven for 35 minutes, checking after 30. Edges should be firm and crispy and center should feel set when lightly touched but still have a little bit of give.
Let cool on wire rack until pan is no longer too hot to handle. Loosen unlined sides of bars from pan edge using a bench scraper or metal spatula, carefully lift out the entire thing and set on wire rack to cool completely.
Cut into squares and enjoy!