Preheat oven to 350 degrees Fahrenheit.
In the bowl of a stand mixer combine the sugar and vegetable oil. Mix well for 1 - 2 minutes until very well combined. Alternatively you can mix the ingredients together with a hand held electric mixer, or with a whisk.
In a separate bowl whisk together the flour, cocoa powder, baking powder, cinnamon and salt and mix until well combined.
With the mixer off, add the flour mixture to the oil and sugar. Then, add the strawberry jam. Mix together for 1 - 2 minutes until everything is combined well.
Using a 1 tablespoon mini scooper, or a spoon, place the dough onto a parchment lined cookie sheet. Leave about 1 inch of space between each cookie.
Bake in the middle rack of your preheated oven for 10 - 12 minutes, being careful not to burn your cookies. Note that your cookies will not change shape too much during the baking process.
As your cookies bake, remove from the oven and transfer immediately to a cooling rack to cool.