Use much smaller simpler button debounce.

boil_kettle/boil_kettle.ino

@@ -8,11 +8,11 @@
 #include <MQTT.h>
 #include <LiquidCrystal_I2C.h>
 #include <LiquidMenu.h> // LiquidMenu_config.h needs to be modified to use I2C.
-#include <Button.h>
 #include <MD_REncoder.h>
 #include <Adafruit_MAX31865.h>
 
 // My Includes
+#include "button.h"
 #include "config.h"
 #include "menu.h"
 
@@ -32,7 +32,7 @@ kettle_mode KettleMode = OFF;
 encoder_state EncoderState = ENC_ST_LINE;
 
 /* ---------- User I/O objects ---------- */
-Button EncoderButton(encoderBTN);
+Button EncoderButton;
 MD_REncoder RotaryEncoder(encoderDT, encoderCLK);
 LiquidCrystal_I2C lcd(0x27,20,4);
 Adafruit_MAX31865 kettleRTD(kettleRTDCS);
@@ -53,8 +53,8 @@ void setup() {
 
   Serial.begin(9600);
   RotaryEncoder.begin();
-  EncoderButton.begin();
   Ethernet.begin(mac, ip);
+  EncoderButton.begin(encoderBTN);
   kettleRTD.begin(MAX31865_3WIRE);
   mashRTD.begin(MAX31865_3WIRE);
   Serial.println("Setting up...");

boil_kettle/button.h

@@ -0,0 +1,22 @@
+#ifndef button_h
+#define button_h
+
+#include "Arduino.h"
+
+class Button
+{
+  private:
+    uint8_t btn;
+    uint16_t state;
+  public:
+    void begin(uint8_t button) {
+      btn = button;
+      state = 0;
+      pinMode(btn, INPUT_PULLUP);
+    }
+    bool pressed() {
+      state = (state<<1) | digitalRead(btn) | 0xfe00;
+      return (state == 0xff00);
+    }
+};
+#endif