*edited to add a pic

Galettes Bretonnes, or French Butter Cookies
Classic French butter cookies made with a shortbread-type of dough and
salted butter.
Ingredients
1/2 cup + 1 tbsp granulated sugar
1/2 cup + 5 tbsp salted butter*
3 egg yolks, separated
1 tsp vanilla extract
2 cups + 2 tbsp all-purpose flour, plus more for dusting work surface
Instructions
Preheat the oven to 375°F.
Line a baking sheet with parchment paper or a silicone mat.
1. Beat the butter and sugar together on
medium speed until light and fluffy - about 1 minute.
2. Add 2 egg yolks and the vanilla extract, and mix on medium speed until they're incorporated.
Stop to scrape the bowl with a rubber spatula before resuming the mixing. Add the flour in and mix on low speed just until
the dough starts to clump together.
3. Lightly flour a wooden board or counter before placing the mass of dough onto it. Use your hands to shape
the dough into a big ball. Then sprinkle some flour on top of the dough before using a rolling pin to roll the
dough out.
As soon as the dough starts sticking to your pin, sprinkle a pinch of flour on the dough, then resume rolling.
Roll your dough out until it's approximately 1/4" thick.
4. Use medium round cookie cutters (2.25") to cut out round cookies from the dough.
(Or just use a sharp knife to cut the whole shebang into squares.)
If you have a cookie stamp, use it!
Use a sharp-edged spatula to transfer the cookie rounds onto the baking sheet, spaced out from each other.
5. Beat the remaining yolk in a small bowl.
Use a fork to make a cross-hatch pattern on the cookies (drag the fork down vertically on the cookie, then drag the fork across horizontally).
Brush the tops of the cookies with the beaten egg yolk.
5. Bake the cookies for 12 to 15 minutes, until they're a deep golden color. Transfer the cookies to a wire cooling rack to cool completely.
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