Blueberry Macarons

Name: Blueberry Macarons
Prep time: 20 min
Cook time: 17 min
Total time: 37 min
Cuisine: French
Ingredients: 140g superfine almond flour - blanched (1 1/4 cups); 125g powdered sugar (1 cup); 110g aged egg whites - about 4 large egg whites; pinch of cream of tartar - optional; 110g granulated sugar (1/2 cup + 2 tsp); sky blue and navy blue gel food coloring; 56g unsalted butter, room temperature (1/4 cup); 4g vanilla extract (1 tsp); 1g salt (1/8 tsp); 5g heavy cream (1 tsp); 1/4 cup blueberry jam or jelly; Edible black marker; Kitchen scale; Stand Mixer or Electric Mixer; Large, flat baking sheets; Silpat Mats (or parchment paper); 1 Large Piping Bag (18-inch); 1 Small Piping Bag; 1 Round Piping Tip - Ateco 805; 1 Small Round Piping Tip - Wilton 5; Scribe or toothpick