These muffins are fluffy and fun while being impossibly tender and moist. Ricotta keeps them from being dry while lemon zest and juice provide a punch of sweet citrus.
Sift together the flour, baking soda, baking powder, and salt.
In a separate bowl, using a hand mixer or stand mixer, whip together the butter, sugar, lemon zest, and ricotta until well combined.
Mix the egg, lemon juice and milk into the ricotta mixture.
Fold in the flour mixture, ½ cup at a time until just combined.
Spray a muffin pan with non-stick spray or line with paper liners.Evenly scoop the batter into the muffin pan, dividing it equally amongst the cups.
Make the Vanilla Crumble:Mix together the sugar, melted butter, flour, and vanilla. It should form a thick paste. Sprinkle this crumble over the tops of each unbaked muffin, dividing evenly amongst the 12 muffins.
Bake the muffins, about 18 minutes or until a toothpick inserted into the center comes out clean.