Preheat oven to 350°F. Line a sheet pan with parchment paper or a silicone liner. Melt coconut oil, then measure 1/4 cup and let it cool to room temperature before using.
Add all ingredients except the chocolate chips to a large bowl or stand mixer. Using hand mixers or the whisk attachment, mix until fully combined, scraping down the sides as needed.
Switch to a spatula and mix in 1 cup dark chocolate chips and all the mini chocolate chips.
Use a 1-1/2 tablespoon cookie scoop to pack dough into tight balls, pressing firmly so they hold together. Place on the prepared sheet pan, spacing cookies about 2 inches apart.
Bake for 8 to 10 minutes, until tops are set (they don't look gooey) but still slightly soft. Do not over-bake; these are best slightly under-baked and they firm up more as they cool.
Remove from oven and gently tap the pan on the counter a few times to flatten cookies slightly. Press remaining chocolate chips into the tops.
Let cookies cool on the pan. Sprinkle with flaky sea salt if desired. Best enjoyed warm while soft and chewy!
Notes
Note 1: Use pure maple syrup. The only ingredient listed should be maple syrup.Note 2: Use both types of oats for the right texture. Quick oats absorb more liquid than old-fashioned oats, and the amounts are created for that.