Melt your butter on the stove or in a microwave.
Whisk together flour, salt, and baking powder while the butter melts. Pour in your butter and with clean hands, rub in the butter to the flour until its incorporated and crumbly.
Heat water in a kettle or use the hottest tap water you can. Pour the cup of hot water and the ¼ cup of heavy cream into the flour & butter mixture. Use a spatula or your hands to mix.
Turn out the dough onto a clean surface and knead for 5-10 minutes until nice and soft. The dough should be tacky but not sticking. You shouldn't need additional flour for kneading here its should come together into a smooth dough.
Form into a ball and set on the counter and cover with plastic wrap for 20 minutes.
Split the dough into 16 equal pieces. I usually don't weigh this I just split the ball into fourths and then each fourth into fourths again for a total of 16. It's okay if there's some variation in size.
Form each piece into a ball and cover on the counter while you heat up your cast iron on the stove.
Heat a cast iron pan on the stove on medium/high. Keep an eye on the heat, you want it nice and hot but not so much that it burns the tortillas quickly.
Take each ball of dough and roll out with a rolling pin as thin as you can. Usually they are around 8-10 inches in diameter. You want a paper thin tortilla. Don't flour your surface as you'll need the tortilla to stick to the counter in order to get it to stretch as much as you can. Feel free to use your fingers to stretch the dough between rolling it to keep the shape circular. Prep a few before you start cooking so you're not behind on rolling as you cook.
Peel the dough carefully up from the counter and set gently into your hot cast iron pan. Cook each piece of tortilla for 30-60 seconds on each side. You want to get nice golden bubbles forming.
Set each cooked tortilla aside in a clean tea towel or folded piece of parchment paper to keep the steam inside to keep them nice and soft.
Enjoy immediately or store in the fridge or freezer. Reheat before enjoying to soften them back up!