oatmeal-cookies.md: Add notes about my janky Pyrex measuring cup

oatmeal-cookies.md

@@ -5,15 +5,15 @@ Makes: 24
 
 ## Ingredients
 
-- 1 cup raisins or cranberries
-- 1¼ cups all-purpose flour
+- 1 cup raisins or cranberries (240ml in my Pyrex measuring cup)
+- 1¼ cups all-purpose flour (300ml in my Pyrex measuring cup)
 - 1 tablespoon plus 1 teaspoon ground cinnamon
 - 2 teaspoons baking soda
 - 1½ teaspoons fine sea salt
-- 1½ sticks slightly softened butter
-- 1 cup light brown sugar, firmly packed
+- 1½ sticks slightly softened butter (~150 grams)
+- 1 cup light brown sugar, firmly packed (240ml in my Pyrex measuring cup)
 - 6 tablespoons granulated sugar
-- 2 cups old-fashioned or rolled oats
+- 2 cups old-fashioned or rolled oats (1 pint / 480ml in my Pyrex measuring cup)
 - 1 extra-large egg
 - 1½ teaspoons vanilla extract