Step 1
Place bacon in a large skillet and cook over medium-high heat turning occasionally until evenly browned about 10 minutes. Drain bacon grease into a small glass container and chill until set at least 1 hour. Cut bacon strips into 1/4-inch slices.
Step 2
Preheat oven to 400 degrees F (200 degrees C). Line a baking sheet with parchment paper.
Step 3
Combine flour and 1 tablespoon plus 1 teaspoon baking powder in a large bowl. Measure out 6 tablespoons plus 2 teaspoons chilled bacon grease into the bowl. Knead grease into the flour mixture with one hand turning bowl with the other until dough is crumbly.
Step 4
Make a well in the center of the dough and slowly pour in 10 tablespoons plus 2 teaspoons milk. Mix with one hand until milk is incorporated and dough feels wet to the touch. Form dough into a thick disc. Cut into 16 equal-sized pieces with a knife.
Step 5
Roll dough into individual balls and place them on the baking sheet. Flatten them into circles about 2 1/2 inches in diameter. Place a tablespoon of bacon slices in the center of 8 circles. Top with remaining circles of dough. Seal so that the top circle meets the bottom using your fingertips.
Step 6
Whisk egg yolk with maple syrup in a bowl; brush over sides and top of each scone. Let scones rest about 15 minutes.
Step 7
Bake in the preheated oven until golden brown 12 to 15 minutes.
Step 8
Place a clean towel on a plate transfer scones to the towel and fold towel over to keep warm.