Prepare 9x9 or similar size baking dish. Brush lightly with oil or butter and line with parchment paper.
Toast pecans (both for the base and mix-in), oats, and coconut flakes in 350 degree oven until golden and fragrant - about 10 minutes. It helps to put the pecans in a separate pan, so you can portion the mix-in and base more easily. Put all base ingredients in a large bowl, set aside.
Mix all of the glue ingredients, except the vanilla, in a small saucepan, bring to a light simmer for about 2 minutes. Remove from heat, add vanilla.
Add the glue to the base ingredients and toss to combine. Add the mix-ins and mix until all components are combined.
Press down into baking dish. Bars should be just under 1" thick. Use flat bottom of a glass or measuring cup to get an even top.
Place into 350 degree oven for 15 minutes.
Remove from oven and let cool completely before cutting.
Cut into size desired. Store with parchment paper in between each bar to prevent sticking. Store in refrigerator for up to 1 week, or in freezer for up to 3 months.