- Prepare two muffin tins with non-stick cooking spray. (or goop, recipe below) 
- Whisk flour, baking powder, and salt together in large bowl. 
- Mix sugar and eggs together in a stand mixer until combined, about 45 seconds. 
- Add in butter, buttermilk and vanilla and mix until just combined. 
- Remove bowl from mixer and fold in the flour mixture. Once mostly combined, gently add the blueberries into batter. 
- Use ice cream scoop or large spoon to divide batter equally among prepared muffin cups (approximately ¼ heaping cup batter). 
- Sprinkle top of muffins with pie crust crumble, about a teaspoon per muffin. 
- Bake at 350°F for 17-19 minutes, or until muffin tops are golden and just firm. 
- Cool muffins in muffin tin for 5 minutes, then transfer to wire rack