Add chopped sage leaves, thyme leaves, salt, pepper, and cinnamon to a small bowl
Add 1/2 stick (1/4 cup) of butter to skillet and preheat to medium-low
Once butter is beginning to bubble, add chopped onions and sauté until turning translucent softened
Add minced garlic and stir until fragrant
Add chicken livers to pan, spacing out so they cook evenly
Flip chicken livers once brown on first side, and brown on the opposite side
Continue to cook, stirring and chopping up liver into smaller pieces with stirring utensil. Cook until brown all the way through
Add spice and herb mixture to skillet and stir until fragrant
Pour splash of rum (if using) into skillet and quickly light on fire, allowing alcohol to burn off
Remove from heat and pour liver mixture into a bowl. Allow to cool to room temperature
Once room temperature, add ingredients to blender along with the rest of the stick (1/4 cup) of room temperature butter. Blend until smooth.
Transfer blended liver mixture from blender to metal mesh sieve placed over bowl
Press through metal mesh sieve with silicone spatula, by spreading around and firmly pressing.
Add the pressed, smooth liver pate that made it through the mesh to glass storage container
Cover and place in refrigerator to cool for at least 2 hours
Serve on crackers, toast, or any way you like - enjoy!