Tender crumbed, crispy top, tons of chocolate chips!
Preheat the oven to 400F/200C. Line a muffin tray with cupcake liners. In a large bowl, whisk together the milk, sugar, eggs, lemon zest and vanilla extract. In a small bowl combine the flour, baking powder, cinnamon, chocolate chips, and salt.
Combine the dry ingredients with the wet ingredients. Using a wooden spoon or spatula, carefully incorporate the ingredients until you are left with a lumpy batter (like pancake batter. Don't worry the lumps bake out).
Spoon the batter into the cupcake liners (about 3/4 full). Bake for 15-20 minutes, depending on how hot your oven gets. Check your muffins at the 15-minute mark. Lightly press on them, if they spring back your muffins are cooked! Let them cool on a wire rack for 5 minutes before consuming all of them with a glass of milk!