Place butter in instant pot and turn on low sauté mode to melt
Once the butter has melted, turn off sauté mode and remove the "pot" from the instant pot base (if you are using a slow cooker, melt butter and add it to a 2.5-3 quart slow cooker)
In a large bowl, mix together 1/2 cup SPLENDA® Naturals Sugar & Stevia Blend, flour, milk, 2 tbsp of the cocoa powder and vanilla and pour over butter.
In a small bowl, mix together remaining SPLENDA® Naturals Sugar & Stevia Blend (1/2 cup) and cocoa powder and sprinkle over the batter.
Pour boiling water over the top and DO NOT MIX.
Turn the Instant Pot to slow cooker mode and cook on high for 3 hours. Your Instant Pot automatically turn to the keep warm method when done cooking. Serve with vanilla ice cream whenever your ready!
***If using a slow cooker, cook for 3 hours on high